"can you find 'Google'?"
While helping my friend looking for some tool to balance the color gradient
use Google to search for information about color gradient
and saw this [Foucault pendulum(Wikipedia)]
he say: "so,this is the tool?" LOL
no!! I replied
anyway,that is Foucault pendulum a device demonstrating the effect of the Earth's rotation by Léon Foucault
"Jean Bernard Léon Foucault (French pronunciation: [ʒɑ̃ bɛʁnaʁ leɔ̃ fuko]) (18 September 1819 – 11 February 1868) was a French physicist best known for his demonstration of the Foucault pendulum, a device demonstrating the effect of the Earth's rotation. He also made an early measurement of the speed of light, discovered eddy currents, and is credited with naming the gyroscope (although he did not invent it)."
wow,I seriously like how the animation showing us the demonstration
Happy 194th Birthday to Léon Foucault!