Jan. 7, 1851: Foucault Gets the Swing of Things http://ifttt.com/images/no_image_card.png

L?on Foucault uses a pendulum to demonstrate the rotation of the Earth. It is the first direct visual evidence not based on watching the stars circle in the sky.



via Wired Top Stories http://feeds.wired.com/~r/wired/index/~3/JSa1ESMeNUs/