00:00if you line up a row of bricks on a flat surface and space them exactly one brick length apart
00:06as they fall on top of each other each brick will knock the next one over but the last one
00:12doesn't
00:13have anything in front of it which lets it slide forward just enough to make the brick in front of
00:19it fall flat and as this one slips forward it lets the next one fall starting a backwards chain
00:27reaction until all the bricks have fallen in a perfectly straight line
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