Frans de Waal: “We have trouble looking at animal intelligence by itself, always asking, ‘Mirror, mirror on the wall, who is the smartest of them all?’ Since there is only one answer that satisfies us, people watching [the chimp] Ayumu’s videotaped performance on the internet couldn’t believe it, saying it must be a hoax. … [Some] American scientists felt they had to go into special training to beat the chimp.” (They failed.)