Chimpanzees consistently choose crystals over ordinary rocks, suggesting a curiosity that may echo early humans.
"Planet of the Apes" may have been onto something. Chimpanzees are steadily honing their tool-using skills—a process unfolding over millennia, driven by the exchange of ideas through migrations ...
Chimpanzees can pick out crystals from a pile of ordinary rocks, handle them with visible care, and even hold them up to peer ...