When he returned to his capital ahead of schedule, all the people there found out that the King had been moved by an ape's tears.

But if a child leaves school thinking that humans don't share a common ancestor with other apes, isn't the truth just that the education system failed them?

"The next stage was something not modern humanlike, nor apelike — it was something entirely different, " she says.

The company tests the serum on apes, one of which goes mad and has to be destroyed.

FLATOW: They're not primates, not like apes and us, who can use little sticks.