The Tower of Hanoi is a puzzle invented by mathematician Edouard Lucas in 1899, in which a stack of discs must be moved between two poles. In its original 64-disk form, it would take a human over 550 billion years to solve. Even a computer takes over a billion years to do it.
The Stepping-Feet Illusion features two rectangles apparently moving like a pair of stepping feet, but they're actually moving at the same constant speed.
The illusion is broken when the striped texture is removed.
Based on a planar leg mechanism known as Jansen's linkage, Theo Jansen's Strandbeest are kinetic beings whose skeletons are made from yellow plastic tube (Dutch electricity pipes) and are able to walk entirely powered by wind
https://t.co/6bP70AGeXC
In 2019, The International Space Station spotted an exotic type of upside-down lightning called a blue jet, which was zipping up from a thundercloud into the stratosphere 😱
I think you can guess from the picture, but for context, here's a list of all of the data that could possibly exist about you, courtesy of Google's privacy policy. (It's under "Categories of information we collect"!)
Domain administrators, if you work or study at an organization that uses Google services.
Law enforcement or other third parties, for the legal reasons described in Sharing your information.