Gnu: Your theory about chimps would be easily tested. Put a dot on one chimp's forehead and then allow another chimp to see him. If the second chimp immediately touches his own forehead, then this would confirm your theory. My guess is, he'd more likely try to touch the first chimp's forehead.

Scientists have discovered some amazing things about the intelligence of chimpanzees. I saw this in a video the other day—

They showed a chimp a video touch-screen with the numbers from 1 to 9 scattered in random locations on the screen. They first taught him to touch the numbers in order: 1, then 2, etc. He learned to do this very reliably, no matter how the numbers were scattered.

Then they made it a little harder. They showed him the numbers for a few seconds, and then all the numbers were replaced by black dots. He could still touch the dots in the correct order. In other words, he had memorized the locations of the numbers.

Then they decreased the time he was allowed to look at the numbers. When the numbers were only flashed on the screen for a fraction of a second, he could still touch the dots in the correct order, and he could do this more reliably than any human.

It's getting kind of scary.