I'm not sure we know exactly, but random motion of the particles, if not perfectly balanced, would have a net angular momentum. (religion.blogs.cnn.com)
Gravity tends to pull stars and planets into tidy spheres, but these shapes can be altered by random motions and interactions. (discovermagazine.com)
Markets are always going up and down, and if you have a way to distinguish a real market move from random motion, you can be back in the market before most investors know that the bull is back in town. (cabotwealth.com)