And after about three months, the nerves grew in a little bit and we could get a twitch.

And we've come a long way since Galvani's and Susana's first successes in making animals twitch or jump.

Instead, performance capture technology, originally invented for the movie Avatar, enables a human actor, Andy Serkis, to play the role of the chimpanzee Caesar, not by dressing in a chimp suit, but by having every gesture and facial movement, even the twitch of an eyebrow, transformed into the movement of an ape.