Selon cette captivante enquête scientifique, il semblerait que notre cerveau ne soit pas le seul maître à bord. Il y a quelques années, les scientifiques ont découvert en nous l’existence d’un deuxième cerveau. Notre ventre contient en effet deux cents millions de neurones qui veillent à notre digestion et échangent des informations avec notre "tête". Les chercheurs commencent à peine à décrypter cette conversation secrète. Ils se sont aperçus par exemple que notre cerveau entérique, celui du ventre, produisait 95 % de la sérotonine, un neurotransmetteur qui participe à la gestion de nos émotions. On savait que ce que l'on ressentait pouvait agir sur notre système digestif. On découvre que l'inverse est vrai aussi : notre deuxième cerveau joue avec nos émotions. ARTE Bande annonce |
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When you look at sporting achievements over the last decades, it seems like humans have gotten faster, better and stronger in nearly every way. Yet as David Epstein points out in this delightfully counter-intuitive talk, we might want to lay off the self-congratulation. Many factors are at play in shattering athletic records, and the development of our natural talents is just one of them.
Duration 14.53 TED How did your body become the complicated, quirky, amazing machine it is today? Anatomist Neil Shubin uncovers the answers in this new look at human evolution. Using fossils, embryos and genes, he reveals how our bodies are the legacy of ancient fish, reptiles and primates — the ancestors you never knew were in your family tree. The three-part series premieres April 9, 2014.
PBS - Written by Anonymous They uncover the kangaroo's lower jaw, which splits in two, and a massive Achilles tendon that enables it to hop like a frog.
But it's the reproductive anatomy they find most surprising: the male genitalia is back to front, while females have three vaginas as well as the pouch in which they grow their young from jelly-bean-sized embryos. Channel 4 Channel 4
So many hippos congregate to feed in Zambia's Luangwa Valley that they threaten the survival of other species in the park, so the authorities cull around 200 of them every year. The cull offers veterinary scientist Mark Evans and comparative anatomist Joy Reidenberg the opportunity to dissect one of these magnificent animals. Hippos are often mistakenly seen as Africa's laziest giant, lolling around all day in the mud. But as the team discover, at night they're surprisingly active. Duration 47:15 Mark Evans and Joy Reidenberg travel to South Africa to dissect the first primate on Inside Nature's Giants: a huge alpha male baboon that led a band of baboons on a rampage through a Cape Town suburb until the authorities were forced to euthanise him as he grew increasingly violent.
Duration 47:34 Veterinary scientist Mark Evans and comparative anatomist Joy Reidenberg dissect the whale's enormous organs to reveal the secrets of this 45-foot deep-sea giant, which stranded and died on Pegwell Bay in Kent.
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