Fleas in a Jar

This is supposed to be true based on an experiment.

You can place some fleas in a jar with a lid on it. The fleas will begin to jump, repeatedly hitting the lid in their attempt to escape.

After about 20 minutes, the fleas begin to learn that they cannot escape and stop jumping as high as they did to begin with, to avoid smacking their head on the lid.

Once they become accustomed to the fact that they cannot escape, you can remove the lid and the fleas will continue to jump at the same height, never escaping the jar. Since the fleas BELIEVE they cannot escape the confines of the jar, they stop trying. Because of their experience with smacking their heads repeatedly, every time they tried to escape, they never even bother looking up to see that the lid is no longer there.

If you introduce a new flea it will jump up and out and the others will then believe they have a shot out of the jar.

I think Obama is the new flea.