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.
We've covered how to prove that the earth revolves around the sun, just in case you're sent back in time. Now your patrons grow impatient. What have you done for them lately? Keep the grog flowing by explaining Foucault's Pendulum.
Stressed-out scientists can now relax with the Sandpendel, a mashup Zen sand-garden/physics-experiment desktop toy. Designed by Jürg Näf, the Sandpendel is based on Léon Foucault's famous 19th-century experiment that demonstrated the Earth's rotation. Details, plus another pic, are below.