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Tyler DeWitt: Hey science teachers -- make it fun
Tyler DeWitt: Hej, učitelji naravoslovja -- naj bo zabavno
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Srednješolski učitelj Tyler DeWitt je bil navdušen nad učno uro o bakterijah (kako kul!) -- in obupan, ko so jo učenci sovražili. Težava je bila v učbeniku; tega je bilo nemogoče razumeti. Učitelje naravoslovja vzpodbudi, da pustijo ob strani žargon in ekstremno natančnost in naj se namesto tega naravoslovje razlaga z zgodbami in prikazi. (Posneto na TEDxBeaconStreet)
Tyler DeWitt - Science enthusiast
Tyler DeWitt recognizes that textbooks are not the way to get young people interested in science. Instead, he teaches science by making it fun and fantastical. Full bio
Tyler DeWitt recognizes that textbooks are not the way to get young people interested in science. Instead, he teaches science by making it fun and fantastical. Full bio
Double-click the English transcript below to play the video.
00:16
Let me tell you a story.
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Naj vam povem zgodbo.
00:18
It's my first year as a new high school science teacher,
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To je prvo leto mojega poučevanja
naravoslovja na srednji šoli
naravoslovja na srednji šoli
00:22
and I'm so eager.
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in sem zelo zavzet.
00:23
I'm so excited, I'm pouring myself into my lesson plans.
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Zelo sem navdušen
in res se potrudim za svoje učne ure.
in res se potrudim za svoje učne ure.
00:28
But I'm slowly coming to this horrifying realization
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Počasi pa doumevam nekaj groznega,
00:33
that my students just might not be learning anything.
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in sicer da se moji učenci morda ničesar ne naučijo.
00:38
This happens one day:
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Nekega dne se je zgodilo tole:
00:41
I'd just assigned my class to read this textbook chapter
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mojemu razredu sem naročil,
naj preberejo poglavje v učbeniku
naj preberejo poglavje v učbeniku
00:44
about my favorite subject in all of biology:
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o moji najljubši temi pri biologiji:
00:47
viruses and how they attack.
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virusi in kako napadajo.
00:51
And so I'm so excited to discuss this with them,
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Tako se veselim, da bom z njimi razpravljal o tem.
00:53
and I come in and I say, "Can somebody please explain
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Pridem v razred in rečem: "Mi lahko kdo, prosim, razloži,
00:57
the main ideas and why this is so cool?"
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kaj so glavne ideje in zakaj je to tako kul?"
01:01
There's silence.
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Tišina.
01:03
Finally, my favorite student, she looks me straight in the eye,
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Končno me moja najljubša učenka
pogleda naravnost v oči
pogleda naravnost v oči
01:07
and she says, "The reading sucked."
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in reče: "Tekst je bil beden."
01:11
And then she clarified. She said, "You know what,
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Nato je pojasnila. Dejala je: "Veste,
01:15
I don't mean that it sucks. It means that I didn't understand a word of it.
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ne mislim, da je zanič.
Pomeni, da nisem razumela niti besede.
Pomeni, da nisem razumela niti besede.
01:18
It's boring. Um, who cares, and it sucks."
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Dolgočasno je. Mislim, koga briga, in še zanič je."
01:23
These sympathetic smiles
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Po sobi so se zdaj razširili
01:27
spread all throughout the room now,
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sočutni nasmehi.
01:29
and I realize that all of my other students are in the same boat,
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Jaz pa sem dojel, da so vsi moji učenci na istem,
01:34
that maybe they took notes or they memorized definitions from the textbook,
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da so si morda naredili zapiske
ali so si zapomnili definicije iz učbenika,
ali so si zapomnili definicije iz učbenika,
01:38
but not one of them really understood the main ideas.
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a nobeden izmed njih ni zares razumel glavnih idej.
01:43
Not one of them can tell me why this stuff is so cool,
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Niti eden mi ne zna povedati, zakaj je to tako kul,
01:46
why it's so important.
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zakaj je tako pomembno.
01:48
I'm totally clueless.
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Popolnoma sem zgubljen.
01:51
I have no idea what to do next.
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Pojma nimam, kaj naj storim naprej.
01:55
So the only thing I can think of is say,
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Edina reč, ki se je spomnim, je:
01:57
"Listen. Let me tell you a story.
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"Poslušajte. Naj vam povem zgodbo.
02:01
The main characters in the story are bacteria and viruses.
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Glavni liki v zgodbi so bakterije in virusi.
02:07
These guys are blown up a couple million times.
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Te tipe povečamo par milijonkrat.
02:11
The real bacteria and viruses are so small
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Prave bakterije in virusi so tako majhni,
02:14
we can't see them without a microscope,
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da jih ne moremo videti brez mikroskopa.
02:16
and you guys might know bacteria and viruses
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Morda poznate viruse in bakterije,
02:18
because they both make us sick.
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ker zaradi obeh zbolimo.
02:21
But what a lot of people don't know is that viruses
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Veliko ljudi pa ne ve, da virusi
02:24
can also make bacteria sick."
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lahko okužijo tudi bakterije."
02:27
Now, the story that I start telling my kids,
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Zgodba, ki jo začnem pripovedovati otrokom,
02:29
it starts out like a horror story.
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se začne kot grozljivka.
02:34
Once upon a time there's this happy little bacterium.
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Nekoč je živela majhna vesela bakterija.
02:37
Don't get too attached to him.
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Ne navežite se preveč nanjo.
02:40
Maybe he's floating around in your stomach
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Morda plava v vašem želodcu
02:44
or in some spoiled food somewhere,
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ali nekje v pokvarjeni hrani
02:46
and all of a sudden he starts to not feel so good.
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in kar naenkrat se ne počuti tako dobro.
02:50
Maybe he ate something bad for lunch,
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Morda je pojedel nekaj pokvarjenega za kosilo.
02:52
and then things get really horrible,
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Nato stvari postanejo res srhljive,
02:55
as his skin rips apart, and he sees a virus
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ko se njegova koža razpara in vidi,
02:57
coming out from his insides.
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kako iz njega prihaja virus.
03:00
And then it gets horrible
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Nato postane grozljivo,
03:03
when he bursts open and an army of viruses
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ko se razpoči in iz njega priplava
03:06
floods out from his insides.
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cela četa virusov.
03:09
If -- Ouch is right! --
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Če -- prav imate, auč! --
03:12
If you see this, and you're a bacterium,
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če to vidite in ste bakterija,
03:15
this is like your worst nightmare.
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je to kot najhujša nočna mora.
03:18
But if you're a virus and you see this,
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Če pa ste virus in to vidite,
03:21
you cross those little legs of yours and you think,
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prekrižate svoje nogice in si mislite:
03:23
"We rock."
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"Mi smo zakon."
03:26
Because it took a lot of crafty work to infect this bacterium.
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Potrebno je bilo veliko iznajdljivosti,
da so okužili to bakterijo.
da so okužili to bakterijo.
03:31
Here's what had to happen.
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Zgodilo se je naslednje.
03:33
A virus grabbed onto a bacterium
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Virus se je pripel na bakterijo
03:36
and it slipped its DNA into it.
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in vanjo spustil svoj DNK.
03:40
The next thing is, that virus DNA made stuff
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Nato je ta virusni DNK naredil tisto snov,
03:43
that chopped up the bacteria DNA.
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ki je razsekala bakterijin DNK.
03:47
And now that we've gotten rid of the bacteria DNA,
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Zdaj, ko smo se znebili bakterijskega DNK,
03:50
the virus DNA takes control of the cell
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virusni DNK prevzame nadzor nad celico
03:54
and it tells it to start making more viruses.
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ter ji začne narekovati, da naredi več virusov.
03:58
Because, you see, DNA is like a blueprint
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Veste, DNK je kot načrt,
04:02
that tells living things what to make.
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ki živim bitjem pove, kaj izdelovati.
04:05
So this is kind of like going into a car factory
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To je nekako tako, kot da bi šli v tovarno avtomobilov
04:08
and replacing the blueprints with blueprints for killer robots.
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in zamenjali načrte s takimi za ubijalske robote.
04:14
The workers still come the next day, they do their job,
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Delavci pridejo naslednji dan in opravijo delo,
04:17
but they're following different instructions.
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a sledijo drugačnim navodilom.
04:21
So replacing the bacteria DNA with virus DNA
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Ko se bakterijski DNK zamenja z DNK-jem virusa,
04:24
turns the bacteria into a factory for making viruses --
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to spremeni bakterijo v tovarno za izdelavo virusov --
04:29
that is, until it's so filled with viruses that it bursts.
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no, dokler ni tako polna virusov, da poči.
04:33
But that's not the only way that viruses infect bacteria.
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A to ni edini način, da virusi okužijo bakterije.
04:38
Some are much more crafty.
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Nekateri so veliko bolj iznajdljivi.
04:44
When a secret agent virus infects a bacterium,
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Ko skrivni virusni agent okuži bakterijo,
04:48
they do a little espionage.
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malo vohuni naokrog.
04:51
Here, this cloaked, secret agent virus is slipping his DNA into the bacterial cell,
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Tukaj ta skrit skrivni virusni agent
v bakterijsko celico podtakne svoj DNK
v bakterijsko celico podtakne svoj DNK
04:59
but here's the kicker: It doesn't do anything harmful -- not at first.
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a tu je trik: ne stori ničesar škodljivega -- vsaj ne na začetku.
05:04
Instead, it silently slips into the bacteria's own DNA,
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Namesto tega se tiho prikrade v bakterijski DNK
05:10
and it just stays there like a terrorist sleeper cell,
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in tam ostane kot nekakšna teroristična speča celica,
05:14
waiting for instructions.
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ki čaka na navodila.
05:17
And what's interesting about this is now whenever this bacteria has babies,
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Kar je pri tem zanimivo, je, da, ko ima bakterija otročičke,
05:23
the babies also have the virus DNA in them.
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imajo tudi te otročički v sebi tudi virusni DNK.
05:29
So now we have a whole extended bacteria family,
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Zdaj imamo celo družino bakterij,
05:32
filled with virus sleeper cells.
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ki je polna spalnih virusnih celic.
05:37
They're just happily living together until a signal happens
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Veselo živijo skupaj, dokler ne pride signal
05:41
and -- BAM! -- all of the DNA pops out.
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in -- BUM! -- ves DNK skoči ven.
05:45
It takes control of these cells, turns them into virus-making factories,
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Prevzame nadzor nad celicami
in jih spremeni v tovarne virsov
in jih spremeni v tovarne virsov
05:49
and they all burst,
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in vse počijo,
05:51
a huge, extended bacteria family,
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cela razširjena družina bakterij,
05:54
all dying with viruses spilling out of their guts,
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vse umirajo, ko se iz njihovih drobovij izlivajo virusi,
05:57
the viruses taking over the bacterium.
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ki so prevzeli bakterije.
06:02
So now you understand how viruses can attack cells.
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Zdaj razumete, kako lahko virusi napadejo celice.
06:06
There are two ways: On the left is what we call the lytic way,
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To sta dva načina: na levi je litičen,
06:10
where the viruses go right in and take over the cells.
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pri katerem virusi vstopijo v celico in prevzamejo nadzor.
06:15
On the [right] is the lysogenic way
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Na desni je lizogeni način,
06:17
that uses secret agent viruses.
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ki uporabi skrivnega virusnega agenta.
06:21
So this stuff is not that hard, right?
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To ni tako zapleteno, kajne?
06:23
And now all of you understand it.
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Vi to vsi razumete.
06:25
But if you've graduated from high school,
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Če ste naredili srednjo šolo,
06:27
I can almost guarantee you've seen this information before.
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vam lahko zagotavljam, da ste to informacijo že videli.
06:31
But I bet it was presented in a way
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Stavim pa, da so jo predstavili na način,
06:33
that it didn't exactly stick in your mind.
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ki ni ravno ostal v glavi.
06:38
So when my students were first learning this,
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Ko so se moji učenci prvič učili o tem,
06:40
why did they hate it so much?
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zakaj so to tako zasovražili?
06:43
Well, there were a couple of reasons.
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No, bilo je nekaj razlogov.
06:45
First of all, I can guarantee you that their textbooks
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Prvič, vam lahko zagotovim, da njihovi učbeniki
06:48
didn't have secret agent viruses, and they didn't have horror stories.
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ne vsebujejo skrivnih virusnih agentov
in nimajo grozljivk.
in nimajo grozljivk.
06:54
You know, in the communication of science
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Veste, v znanstveni komunikaciji
06:57
there is this obsession with seriousness.
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vlada obsedenost z resnostjo.
07:01
It kills me. I'm not kidding.
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To me ubija. Ne šalim se.
07:03
I used to work for an educational publisher,
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Včasih sem delal pri izdaji izobraževalnih knjig.
07:05
and as a writer, I was always told never to use stories
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Kot pisatelju so mi dejali, da ne smem nikoli uporabiti zgodb,
07:09
or fun, engaging language,
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zabavnega ali zanimivega jezika,
07:11
because then my work might not be viewed
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ker mojega dela drugi ne bi videli
07:13
as "serious" and "scientific."
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kot "resnega" ali "znanstvenega".
07:16
Right? I mean, because God forbid somebody have fun
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Kajne? Mislim, da se ne bi slučajno kdo zabaval,
07:19
when they're learning science.
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ko se uči naravoslovja.
07:21
So we have this field of science that's all about slime,
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V naravoslovju je polje, pri katerem se ukvarjamo s sluzjo
07:26
and color changes. Check this out.
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in spremembe v barvah. Poglejte si tole.
07:39
And then we have, of course, as any good scientist has to have,
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Imamo pa jasno tudi, kot katerikoli dobri znanstveniki,
07:44
explosions!
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eksplozije!
07:47
But if a textbook seems too much fun,
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Če pa se učbenik zdi preveč zabaven,
07:52
it's somehow unscientific.
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je na nek način neznanstven.
07:55
Now another problem was that
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Še ena težava je,
07:59
the language in their textbook was truly incomprehensible.
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da je bil jezik v učbeniku resnično nerazumljiv.
08:05
If we want to summarize that story that I told you earlier,
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Če bi želeli povzeti povedano zgodbo od prej,
08:08
we could start by saying something like,
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bi začeli z nečim takim:
08:09
"These viruses make copies of themselves
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"Te virusi izdelajo kopije samih sebe tako,
08:11
by slipping their DNA into a bacterium."
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da v bakterijo podtaknejo svoj DNK."
08:14
The way this showed up in the textbook, it looked like this:
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V učbeniku je to izgledalo nekako takole:
08:17
"Bacteriophage replication is initiated
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"Reprodukcija bakteriofagov se začne
08:21
through the introduction of viral nucleic acid
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z vstavljanjem virusne nukleinske kisline
08:24
into a bacterium."
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v bakterijo."
08:26
That's great, perfect for 13-year-olds.
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To je enkratno, popolno za 13-letnike.
08:31
But here's the thing. There are plenty of people
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A stvar je taka. Veliko ljudi,
08:34
in science education who would look at this and say there's no way
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ki poučuje naravoslovje, bi si to pogledalo
in reklo, da niti slučajno
in reklo, da niti slučajno
08:37
that we could ever give that to students,
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tega ne bi dali svojim učencem,
08:40
because it contains some language that isn't completely accurate.
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ker vsebuje jezik, ki ni popolnoma točen.
08:45
For example, I told you that viruses have DNA.
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Na primer, povedal sem vam, da imajo virusi DNK.
08:47
Well, a very tiny fraction of them don't.
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No, majhen delček njih ga nima.
08:50
They have something called RNA instead.
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Namesto tega majo nekaj, čemur pravimo RNK.
08:53
So a professional science writer would circle that
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Poklicni znanstveni pisatelj bi to obkrožil
08:55
and say, "That has to go.
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in rekel: "To mora ven.
08:56
We have to change it to something much more technical."
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To moramo spremeniti v nekaj bolj strokovnega."
08:58
And after a team of professional science editors
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Ko bi se te res preprosto razlage lotila
09:01
went over this really simple explanation,
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skupina poklicnih znanstvenih urednikov,
09:05
they'd find fault with almost every word I've used,
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bi našli napake v skoraj vsaki besedi, ki sem jo uporabil,
09:10
and they'd have to change anything that wasn't serious enough,
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in bi spremenili vse, kar ni dovolj resno,
09:12
and they'd have to change everything
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in vse,
09:14
that wasn't 100 percent perfect.
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kar ni 100-odstotno popolno.
09:18
Then it would be accurate,
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Potem bi bilo natančno,
09:19
but it would be completely impossible to understand.
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a popolnoma nerazumljivo.
09:24
This is horrifying.
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To je grozljivo.
09:27
You know, I keep talking about this idea
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Veste, kar naprej govorim o tej ideji,
09:29
of telling a story,
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da bi pripovedoval zgodbo.
09:31
and it's like science communication has taken on this idea
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Zdi se, da je znanstvena komunikacija prevzela to idejo,
09:36
of what I call the tyranny of precision,
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ki ji jaz pravim tiranija natančnosti,
09:39
where you can't just tell a story.
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kjer enostavno ne smete povedati zgodbe.
09:41
It's like science has become that horrible storyteller
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Kot da je znanost postala tisti zanič pripovedovalec zgodb,
09:46
that we all know, who gives us all the details nobody cares about,
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ki ga vsi poznamo, ki nam pove vse podrobnosti,
ki nikogar ne zanimajo,
ki nikogar ne zanimajo,
09:50
where you're like, "Oh, I met my friend for lunch the other day,
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ko je nekako tako: "Ah, zadnjič sem šel s prijateljico na kosilo
09:54
and she was wearing these ugly jeans.
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in je imela oblečene take grde kavbojke.
09:55
I mean, they weren't really jeans, they were more kind of, like, leggings,
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Mislim, pravzaprav niso bile kavbojke,
bile so kot nekakšne pajkice,
bile so kot nekakšne pajkice,
09:58
but, like, I guess they're actually kind of more like jeggings,
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ampak pravzaprav so bile nekako bolj kot mešanica obeh,
10:01
like, but I think — " and you're just like, "Oh my God.
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recimo, ampak mislim, da ... " in vi si mislite: "O, bog.
10:03
What is the point?"
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Kaj hočeš povedati?"
10:06
Or even worse, science education is becoming
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Ali, kar je še huje, postaja učenje naravoslovja
10:10
like that guy who always says, "Actually."
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podobno tistemu tipu, ki vedno pravi: "V bistvu."
10:14
Right? You want to be like, "Oh, dude,
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Kajne? Najraje bi rekli: "Model,
10:17
we had to get up in the middle of the night
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morali smo vstati smo sredi noči
10:18
and drive a hundred miles in total darkness."
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in se peljati 150 kilometrov v popolni temi."
10:22
And that guy's like, "Actually, it was 87.3 miles."
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In ta tip reče: "V bistvu je bilo 138,8 kilometrov."
10:26
And you're like, "Actually, shut up!
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In vi rečete: "V bistvu bodi tiho!
10:29
I'm just trying to tell a story."
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Rad bi povedal zgodbo."
10:33
Because good storytelling is all about emotional connection.
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Ker je dobro pripovedovanje zgodbe
odvisno od čustvene povezave.
odvisno od čustvene povezave.
10:39
We have to convince our audience
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Svoje občinstvo moramo prepričati,
10:42
that what we're talking about matters.
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da je to, o čemer govorimo, pomembno.
10:45
But just as important is knowing
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Ravno tako pa je pomembno, da vemo,
10:47
which details we should leave out
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katere podrobnosti moramo izpustiti,
10:50
so that the main point still comes across.
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da še vedno povemo glavno sporočilo.
10:53
I'm reminded of what the architect Mies van der Rohe said,
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To je opomnik na besede arhitekta Mies van der Rotha,
10:57
and I paraphrase, when he said that sometimes
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parafraziram, dejal je, da se je včasih
11:00
you have to lie in order to tell the truth.
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potrebno zlagati, da poveste resnico.
11:03
I think this sentiment is particularly relevant
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Zdi se mi, da to še posebej drži
11:06
to science education.
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za učenje naravoslovja.
11:09
Now, finally,
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Zdaj, končno,
11:12
I am often so disappointed
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sem pogosto tako razočaran,
11:17
when people think that I'm advocating
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ko ljudje mislijo, da zagovarjam
11:19
a dumbing down of science.
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poneumljanje naravoslovja.
11:22
That's not true at all.
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To sploh ni res.
11:24
I'm currently a Ph.D. student at MIT,
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Trenutno na MIT-ju pišem doktorat
11:27
and I absolutely understand the importance of detailed,
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in popolnoma razumem, kako pomembna je podrobna,
11:32
specific scientific communication between experts,
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natančna znanstvena komunikacija med strokovnjaki,
11:36
but not when we're trying to teach 13-year-olds.
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a ne, ko poskušamo naučiti 13-letnike.
11:41
If a young learner thinks that all viruses have DNA,
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Če mlad učenec misli, da imajo vsi virusi DNK,
11:46
that's not going to ruin their chances of success in science.
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to ne bo uničilo njegovih možnosti za uspeh v naravoslovju.
11:51
But if a young learner can't understand anything in science
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A če mlad učenec ne razume ničesar pri naravoslovju
11:55
and learns to hate it because it all sounds like this,
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in ga začne sovražiti, ker vse zveni tako,
11:59
that will ruin their chances of success.
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bo to uničilo njihove možnosti za uspeh.
12:03
This needs to stop,
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To se mora prenehati
12:06
and I wish that the change could come from the institutions
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in želim si, da bi te spremembe izhajale iz najvišjih ustanov,
12:09
at the top that are perpetuating these problems,
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ki nadaljujejo s temi problemi,
12:12
and I beg them, I beseech them to just stop it.
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in prosim jih ter rotim, da naj že prenehajo.
12:16
But I think that's unlikely.
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Mislim pa, da je to neverjetno.
12:19
So we are so lucky that we have resources
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Srečo imamo, da imamo vire,
12:22
like the Internet, where we can circumvent these institutions
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kot je internet, kjer lahko preslepimo te ustanove
12:25
from the bottom up.
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od spodaj navzgor.
12:28
There's a growing number of online resources
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Narašča namreč število internetnih sredstev,
12:32
that are dedicated to just explaining science
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ki so posvečeni razlagi naravoslovja
12:35
in simple, understandable ways.
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na preprost in razumljiv način.
12:38
I dream of a Wikipedia-like website that would explain
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Sanjam o strani podobni Wikipediji, ki bi razložila
12:41
any scientific concept you can think of
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katerikoli znanstveni koncept, ki si ga lahko izmislite,
12:44
in simple language any middle schooler can understand.
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s preprostimi besedami,
ki bi jih razumel katerikoli osnovnošolec.
ki bi jih razumel katerikoli osnovnošolec.
12:49
And I myself spend most of my free time
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Jaz preživljam večino svojega prostega časa tako,
12:52
making these science videos that I put on YouTube.
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da na YouTube dajem takšne znanstvene videe.
12:56
I explain chemical equilibrium using analogies
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Kemijsko ravnovesje pojasnim z analogijo
12:59
to awkward middle school dances,
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nerodnega osnovnošolskega plesa
13:01
and I talk about fuel cells with stories
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in o gorivnih celicah pripovedujem zgodbe
13:04
about boys and girls at a summer camp.
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o fantih in dekletih na poletnih taborih.
13:07
The feedback that I get is sometimes misspelled
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Odgovori, ki jih dobim, so včasih napačno črkovani
13:11
and it's often written in LOLcats,
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in pogosto napisani z SMS jezikom,
13:13
but nonetheless
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a so vseeno
13:16
it's so appreciative, so thankful
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tako pohvalni in hvaležni ,
13:20
that I know this is the right way
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da vem, da je to pravi način,
13:24
we should be communicating science.
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kako bi morali govoriti o naravoslovju.
13:27
There's still so much work left to be done, though,
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Ostaja pa še veliko dela
13:30
and if you're involved with science in any way
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in, če se kakorkoli ukvarjate z naravoslovjem,
13:33
I urge you to join me.
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vas spodbujam, da se mi pridružite.
13:36
Pick up a camera, start to write a blog, whatever,
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Vzemite kamero v roke, pričnite blog, karkoli,
13:41
but leave out the seriousness, leave out the jargon.
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a izpustite resnost in izpustite žargon.
13:46
Make me laugh. Make me care.
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Nasmejte me. Naredite tako, da mi bo mar.
13:49
Leave out those annoying details that nobody cares about
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Izpustite nadležne podrobnosti, ki nikogar ne zanimajo,
13:52
and just get to the point.
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in povejte bistvo.
13:56
How should you start?
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Kako naj bi začeli?
13:58
Why don't you say, "Listen, let me tell you a story"?
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Zakaj ne bi kar rekli: "Poslušaj, naj ti povem zgodbo"?
14:03
Thank you.
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Hvala.
14:05
(Applause)
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(aplavz)
ABOUT THE SPEAKER
Tyler DeWitt - Science enthusiastTyler DeWitt recognizes that textbooks are not the way to get young people interested in science. Instead, he teaches science by making it fun and fantastical.
Why you should listen
Tyler DeWitt has taught Biology, Chemistry and English at high schools in both the United States and South Korea, and believes that science could be every student’s favorite class if it weren’t for the long words and overly technical presentation. Instead, DeWitt focuses on creating engaging lessons that evoke a sense of wonder in kids and that encourage them to think critically.
Currently a Ph.D. student in Microbiology at MIT, DeWitt studies how bacteria transfer pieces of DNA to their neighbors. He is also a coordinator for the MIT+K12 video outreach project, which encourages MIT students to create educational videos for students of all ages in all subjects. DeWitt also has a full YouTube library of videos that teach everything from valence electrons to the chemistry of acids, all with an eye toward fun.
Tyler DeWitt | Speaker | TED.com