Spinning objects have strange instabilities known as The Dzhanibekov Effect or Tennis Racket Theorem - this video offers an intuitive explanation. Part of th...
On January 3, 1851, French physicist Leon Foucault started to experiment with his eponymous pendulum, by which he was able to proof the earth's rotation. Actually, how can you prove that the earth is a rotating orb in an easy-to-see experiment and - of course - without space flight? By today, Foucault's simple device is part of numerous natural science museums around the world.
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