Look around and you’ll meet some pretty
smart animals, but there’s no species quite like us. But that wasn’t always true. As recently as 50,000 years ago we walked
the planet along with at least three other human species. Denisovans and real-life Hobbits Homo floresiensis
didn’t leave much behind to know them by, but Neanderthals are a different story. A richer story. The first people to hold Neanderthal skulls
didn’t know what to make of them, until Charles Darwin published his theory of evolution. Like every living thing, modern humans must
have descended from an earlier species, and lots of scientists thought Neanderthals
fit the bill: our primitive, slightly dim-witted ancestor. Ernst Haeckel even tried to name them Homo
stupidus. Other scientists had different ideas, they
rebuilt skeletons to look like cartoon cavemen, instead insisting Neanderthals were some failed,
evolutionary dead end. So: Where do Neanderthals fit in the human
story? Were they a bunch of cotton-headed ninny-muggins? Or were they more intelligent and human
than we give them credit for? And if they were smart, why did they disappear
after they met us? Did Neanderthals really disappear? [OPEN] If you were sharing a subway car with a bunch
of humans and a well-groomed Neanderthal, you might not be able to tell who’s who. Buuuut that’s New York for you. But there were some differences: The big brow
ridge. And huge nose. The weirdly short forearms and shins. And BIG muscles. These were all adaptations to life in cold
northern climates, while our skinny ancestors were built for a warmer, runnier existence. Our bodies are different, but similar enough
that when Neanderthals and our species first met, we would’ve seen something familiar
staring back at us. Neanderthal life carried serious occupational
hazards, considering dinner meant going head to head with wooly mammoths and rhinoceros
like some Paleolithic rodeo riders. Their fossil remains show healed broken bones,
even signs that some were blind, meaning Neanderthal tribes cared for and fed their sick and injured. They even buried their dead. We don’t know if that’s because they were
spiritual, or religious, but Neanderthals definitely weren’t violent brutes. They were caring and social. By 250,000 years ago, there were brains walking
around in Germany as big or bigger than yours or mine… only inside Neanderthal skulls. But if big brains were *everything*, blue
whales would be our overlords! They’re… not, right? Neanderthals used this tool about 200,000
years ago. 150,000 years later their technology had progressed
to this. Not ex actly Steve Jobs. It’s clearly not the size of a brain,
it’s how you use it. Our symbolic thinking, social interactions,
technological innovation, and dad jokes just wouldn’t be possible without our brain’s
ability to fancy words together make. You know: intricate phraseology. Elaborate discourse. Complex language! So could Neanderthals talk? We know that we and Neanderthals share the
same version of a gene, FOXP2, that’s essential for language, but that gene alone isn’t
enough to make a caveman Shakespeare. The shape of Neanderthal brains inside their
skulls suggest they had structures important for speech. Their throats were shaped to make more than
ape sounds. That’s most of the ingredients for *some*
kind of speech and language. But rich communication is possible even without
mouth noises. Scientists think Neanderthals could have exchanged
ideas and told stories by combining simple sounds, musical tones, and rhythmic movement…
just like prehistoric boy bands. [MUSIC] Around 50,000 YA Neanderthals met their very
smart cousins: Us. For five or ten thousand winters and summers,
our ranges overlapped, until Neanderthals suddenly disappeared–poof– about 40,000
years ago. Were we friends? Or enemies? Wherever our nomadic hunting groups clashed
for territory, our species had deadlier weapons. Whereas Neanderthals lived in socially isolated
groups, we readily exchanged technology between tribes, even traded. When it came to innovation and competition
for resources, Neanderthals just couldn’t catch up. Or maybe we just gave them an extinction-level
case of the flu. At their peak, Neanderthal populations probably
never reached six figures worldwide. Like gorillas and orangutans today, they lived
in small, dispersed pockets--which means more inbreeding and less genetic diversity. Maybe Neanderthals were already endangered
when we showed up. Before they disappeared, Neanderthals left
us one present. In 2010, the Neanderthal genome was sequenced
from ancient bones. That genome was compared to modern human genomes. 1 to 4 percent of the genes from ALL living
humans outside sub-Saharan Africa came from Neanderthals. People with sub-Saharan ancestry? No Neanderthal DNA. This tells us Homo sapiens shared a romantic
campfire with Neanderthals and interbred, probably right after our species left Africa,
spreading that Neanderthal DNA as we settled the rest of the globe. Thanks to genetic testing, I know I have more
Neanderthal DNA than 70% of people, which to me is proof that Neanderthals were definitely
intelligent and awesome. So 50,000 years ago we walked beside other
humans. We haven’t completely solved the mystery
of why they disappeared, except to discover that they aren’t totally gone. They live on inside us, the only humans left. But the 7 and a half billion of us alive today
share more than these distant ancestors. We’re a lot more related than you think,
and we’ll talk about that next time. Stay curious. Thanks to 23andme for sponsoring this episode. The name ‘23andMe’ comes from the fact that human DNA is organized into 23 pairs of chromosomes. 23andMe is a personal genetic analysis company created to help people understand their DNA. You can see which regions around the world your ancestors come from, learn how DNA impacts your health, your facial features, hair, even your sense of smell, and how you sleep. You just have to provide a DNA sample by spitting in a tube. I learned that I carry a gene that allows me to smell asparagus odor in my pee, and that I’m likely to have a longer second toe than big toe. Which is true. I have really long toes. But I also learned that one gene I inherited from my Neanderthal ancestors might be a reason I’m taller than most people. You can learn more about your personal DNA story and support our show by going to 23andMe.com/OKAY I studied genetics for my PhD, and learning about my DNA was just… so fun. Let us know if you give it a try. See you next week. This video is part of our special series about the story
of our species: Where we came from, how we’re all connected, and where we’re going. If you haven’t already, check out part 1
and retrace the mysterious path of our family tree. And be sure to subscribe so you don’t miss
any of our videos.
