Tuesday, January 3, 2012

42 – Can you see the future?

We all can, in a limited way. It's what helps us to navigate around the world, to achieve things, to keep on going. Everyone makes short term predictions all the time, but they seem unexceptional because everyone does it. Anyone who has caught a ball, or a frisbee has made a surprisingly complex and accurate prediction of its future course.

There's a species of spider with a brain the size of a pin head. It spots its prey, among the tanlged undergrowth, then it sits there and thinks. It memorises a path from itself, to its prey. Once it's done that, it sets off. It can wander round corkscrew plant stems, lose sight of its prey and still keep on going. It knows when it has chosen a bad path and can replan. It has a brain the size of a pin head. It sees the future.

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