Today marks the 194th birthday of Léon Foucault, the French physicist who used a pendulum to confirm the rotation of the Earth. Today's Google Doodle pays tribute.
In 1851, Leon Foucault demonstrated the Earth's rotation to the world with a magnificent pendulum in the Paris Pantheon. In 2010, that pendulum crashed to the Musée des Arts et Métiers' marble floor. The damage, as they say, is irreparable.