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If you want to spend $20-$40 for a screensaver that's both stunning and ultrageeky, this is it. But you can watch it for free at Molecular Expressions. Starting with the wide view from space, 10 million light-years from the Milky Way galaxy (1023 meters) it gives a ten times smaller close-up every few seconds, down through an oak tree branch outside a Tallahassee lab (100 meters) and on down to a "view" of some quarks (10-16meters).
Of these 40 views, only ten or so are familiar from our personal experience. So—does it make you humble that we know so little, or proud that we know this much?
(Hat tip to A Blog Around The Clock.)