Human beings are clever, bigheaded animals that have proved very formidable
against predators like the now-extinct woolly mammoth and the near-extinct Bengal tiger. But we humans, particularly we modern
humans, are also strangely vulnerable: fleshy, pudgy, and almost entirely
bereft of natural defenses, such as thick outer shells, tusks, or sharp claws.
Moreover, our gangly, awkward, injury-prone bodies are not particularly good at
getting from place to place. Chimpanzees can at least swing from tree to tree —
when was the last time you saw a… more