Bramble noted, is an Achilles tendon, which connects the calf to the heel: we’ve got one, chimps don’t. We have very different feet: ours are arched, chimps’ are flat. Our toes are short and straight, which helps running, while chimps’ are long and splayed, much better for walking. And check out our butts: we’ve got a hefty gluteus maximus, chimps have virtually none. Dr. Bramble then focused on a little-known tendon behind the head known as the nuchal ligament. Chimps don’t have a nuchal ligament. Neither do pigs. Know who does? Dogs. Horses. And humans. Now this was perplexing. The nuchal
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