쉐도잉 연습: Why Can’t We Have Unicorns? - 영상으로 영어 말하기 배우기
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It’s the dream of every little kid out there to befriend a unicorn.
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Riding through a magical land astride your magical companion, the wind blowing through your hair… No?
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Just me? But on the scale of mythical creatures, compared to dragons and basilisks and stuff, unicorns seem downright realistic.
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It’s just a horse who knows how to accessorize!
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You could just as easily ask, why don’t they exist?
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Well, we did ask, and we found some answers.
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Come with me on this highly specific deep dive into the science of how animals evolve to grow stuff out of their heads.
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Okay, if we’re going to unpack this, we need to agree on our definition of a unicorn.
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I know that seems obvious, but this is science!
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We’ve gotta define our assumptions.
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For our purposes today, a unicorn is a horse-adjacent animal with one single horn or pointy appendage growing out of the front of its head, like mine.
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By horse-adjacent, I mean the ungulates: four-legged mammals divided into two main groups based on how their toes work.
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Yes, I know, taxonomy is like that sometimes.
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Horses belong to the odd-toed ungulates, or perissodactyls, but we’re also going to include the even-toed ungulates, or artiodactyls – the group that includes stuff like deer and cows.
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And if that’s all we need, guess what?
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We’re done!
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We’ve got not one but two animals that fit this particular bill.
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The first is almost definitely going to make some of you mad, because it’s narwhals.
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Hear me out!
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They’re cetaceans, which fall into our category of horse-adjacent.
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Cetaceans are a type of ungulate, and they’re so closely related to artiodactyls that some researchers even mash the two names together and call the group “cetartiodactyls,” which is… a mouthful.
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So like it or not, narwhals totally count under our definition.
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And they’ve got a big horn right on the front of their noggins, so that’s one more tick in favor of them being our planet’s unicorns.
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And yes, technically they’re rocking a tooth, not a horn, but we never said what it had to be made of!
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Now a few of you might have clued in to another animal that meets the description we’ve already given, and you are very smart.
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But save it, we’re going to get to that one later.
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Regardless, these real-world animals aren’t exactly going to hit the spot if you want a unicorn.
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They’re like having an oatmeal raisin cookie when you really want chocolate chip - it’s just a poor substitute for the real thing.
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It’s also worth mentioning that humans have manipulated animals like cows and goats to have a single horn in the middle of their heads, whether it’s in the interests of science or hucksterism.
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But we wanna know why unicorns never happen on their own – as a species, rather than a human ploy or a one in a million accident.
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So if we want to look Mother Nature in the eye and ask her how to make a unicorn, we need to look at other animals that have evolved a lot more of the classic horse-y unicorn traits, including anything bone or bone-adjacent growing out of their heads.
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And there are no perissodactyls with any bony head ornaments.
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So to look at the evolution of unicorns, we have to make a quick hop to the next branch of the tree of life, back to artiodactyls.
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Specifically, we’re looking at pecorans, which are things like deer, cows, and pronghorns.
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All of the animals that have evolved bony headgear fall into this category, so to study how to make horns on your head, they’re the perfect animals to examine.
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Plus there’s a lot of old timey illustrations of unicorns with deer-like cloven hooves so I say it counts.
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Now there are technically some differences even within the pecorans.
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For instance, not all headgear is created equal.
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There are anatomical differences between say, horns and antlers.
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Even so, we’re pretty sure all pecoran headgear evolved from one common ancestor that had its own funky headset.
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Which means that the neat trick of growing these specific kinds of horns… only evolved once.
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In evolution, something that happens once could happen again, but it’s not super likely.
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Sorry, horses.
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But does this mean we can have our deer-icorn, if two horns could somehow become one horn?
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A 2019 paper looked at how these guys’ headgear forms and attributed them to neural crest cells: cells that migrate outward from the midline of an organism during embryonic development to create new structures.
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Headgear-starting cells migrate to either side of the skull, towards the back of the braincase, and then become boney sticky outy bits.
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And there are a few genetic changes specific to pecorans that make that happen.
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Like some modifications to the gene OTOP3, which makes a protein associated with biomineralization.
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You know, to make bone grow where it didn’t used to.
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And some changes to the gene OLIG1, which is the one that tells those neural crest cells what to be, and where to go.
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Finally, there’s a bit of shuffling around some of the big boss genes of developmental biology.
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We’re talking Slug, Twist, the Hox genes – I promise these are genes and not words I just chose at random.
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See, while OLIG1 makes the neural crest cells move, these guys are the ones that make sure everybody’s working together properly to make a lovely, finished head-bone.
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Taken together, you have a set of instructions that tell neural crest cells to go to either side of the head and build a brand new bony structure in two very specific places.
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In order to get a deer-icorn, we’d need those genes to tell the neural crest cells to go to the front and center of the head, not onto the sides.
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And they’d have to form just one new bony protuberance, not two.
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Meaning re-re-writing all those headgear gene changes.
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And you don’t mess with genes like that lightly, because if you do interfere with the basic developmental program, odds are you just never get a grown-up organism that can pass those changes on.
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It’s not impossible.
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It seems to have been documented, once, when a deer with a single, centered horn was spotted in Italy in 2008.
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But the folks who spotted him think that that deer’s specific situation probably couldn’t be passed down to its offspring, which means he was in all likelihood, one-of-a-kind.
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So until we see it happen to the genes that do get passed down, we aren’t going to get any deer-icorns.
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And to get a horse-icorn, all that stuff that happened in pecorans would have to happen again in horses.
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Which… is a stretch.
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Okay, so biology basically says we get two horns or nothing, at least in the even-toed ungulate group .
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But what if I told you that the real unicorns have been with us the whole time?
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Get ready because it’s about to blow your mind - it’s rhinos.
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It’s a horse-adjacent animal with one horn on the center of its head!
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Are you not entertained?!
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What do you mean, people have been confusing them since medieval times at least?
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Eat your oatmeal raisin cookies!
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Rhinos and horses are both perissodactyls, meaning that rhinos are a lot more closely related to horses than deer are.
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And as for their sick headgear, I would tell you how rhino horns grow in order to compare them to hypothetical unicorns, but… I can’t.
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Because of the whole poaching thing, rhino horns are extremely illegal to own, and researchers don’t get to have them either.
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Which is valid, but it means we don’t know as much about rhino horn development as we do with deer and cows.
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But we do know rhino horns are made of keratin, so they’re more like a hair-or-fingernail horn instead of a bone or a tooth.
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Could a horse go that route and grow a giant fingernail-horn?
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Well, even though they’re pretty closely related in the grand scheme of things, the two groups are still separated by 50 million years of evolution.
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So it’s really hard to say just when that mutation arose in rhinos, or how many changes the horses would have to go through to get there.
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And again, when there’s a mutation that only happened once, that tells us how unlikely it is to happen a second time.
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So there you have it.
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The reason we can’t have unicorns is basically a developmental biology lecture… you’re welcome.
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But maybe the real reason is that our world just doesn’t have enough unicorn magic.
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Hey, if this episode made you crave a bit of that unicorn magic in your life, we’ve got just the thing for you.
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It’s not this headband though - this is mine.
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We do, though, sell a sticker set highlighting all the real-life unicorns of the world, including our lovely rhinos.
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Head over to the DFTBA store to check them out, along with the rest of our sweet, sweet merch.
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That link is down below in the description.
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Thanks for watching!
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유니콘과 같은 신화적 존재에 대한 호기심은 아이들뿐만 아니라 성인에게도 매력적입니다. 이 비디오를 통해 영어 회화 연습을 하면서, 우리는 유니콘의 진정한 의미와 과학적 배경에 대해 배울 수 있습니다. 유머와 정보가 혼합된 방식으로 대화하며, 유창하게 말하는 능력을 기를 수 있습니다. 이처럼 비디오를 활용한 shadow speak 연습은 자연스럽게 언어를 익히는 데 큰 도움이 됩니다. 또한, 비디오 소재가 흥미롭기 때문에 연습에 대한 동기 부여가 됩니다.
문맥 속의 문법 및 표현
이 비디오에서는 몇 가지 중요한 문법 구조와 표현이 사용되었습니다. 이를 분석하여 영어 회화를 더욱 풍부하게 할 수 있습니다.
- "We need to agree on our definition of a unicorn." - 이 문장은 목표에 대해 합의를 필요로 할 때 유용한 구조입니다.
- "They’ve got a big horn right on the front of their noggins." - 구어체에서 자주 사용되는 즐거운 표현입니다. 말을 쉽게 알아듣게 하고 대화를 더 친근하게 만듭니다.
- "We’ve got not one but two animals that fit this particular bill." - 'not one but two'와 같은 표현은 긍정적인 강조를 만들어내며, 대화의 흐름을 좋게 합니다.
- "So if we want to look Mother Nature in the eye..." - 이와 같이 비유적 표현을 사용하면 내용의 깊이를 더할 수 있습니다.
이러한 문장은 영어 쉐도잉을 통해 연습하면 보다 자연스럽게 사용할 수 있게 됩니다.
일반적인 발음 트랩
비디오에서 등장하는 몇 가지 복잡한 단어와 발음은 학습자에게 도전이 될 수 있습니다:
- " cetaceans" - 이 단어는 '시테이션스'로 발음되며, s와 e의 조화가 중요합니다.
- "artiodactyls" - '아르티어닥틸스'라는 발음은 특히 어렵습니다. 중음절에서의 강세를 주의해야 합니다.
- "pecorans" - '페코란스'의 발음에서도 음절의 흐름이 중요합니다. shadowspeaks 연습을 통해 이러한 발음을 개선할 수 있습니다.
이처럼 발음 연습은 실제 대화에서의 자신감을 높여줄 것입니다. 비디오를 반복 시청하며 영어 회화 연습과 함께 발음 강화를 목표로 해보세요!
이 영상의 문법
화자가 가장 많이 쓰는 문형을 영상 속 실제 표현과 함께 정리했습니다.
| 문형 | 영상 속 표현 |
|---|---|
| 수동태 be + 과거분사 — 누가 하는지보다 무슨 일이 일어나는지에 초점 | be made · is created · have been documented |
| 현재완료 have/has + 과거분사 — 과거의 일이 지금도 관련이 있을 때 | we've already given · have manipulated · have evolved |
| 관계절 who / which + 절 — 사람이나 사물에 대한 추가 정보 | pecorans, which are · offspring, which means |
쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법
쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.