Mathematics, physics.
We live in a chaotic, unpredictable universe. This is a grid of 812 double pendulums, each with slightly different initial conditions for the two angles of the pendulum.
By Jonathan Nafziger, https://t.co/4GwhsBtutN, Used with permission
A woodpecker's tongue is so long that it wraps around its skull to protect its brain from over 1000g of acceleration when it's hammering away
[read more: https://t.co/bFROB6bFgf, https://t.co/eYDUlQdv7i]