00:00If you attach a pendulum to the bottom of another one,
00:03Both start pulling on each other at the same time.
00:06Now the first pendulum carries the second,
00:08and the second pushes back,
00:10which changes the next swing
00:12which changes the one after that.
00:15At first, two double pendulums might start almost identically,
00:19with only a tiny difference between them.
00:21But as they swing,
00:23that tiny difference gets amplified over and over again,
00:26Until they're moving in completely unpredictable directions.
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