Rjukan (Norway) and Viganella (Italy) are both situated in deep valleys where mountains block the sun’s rays for up to 6 months every year, so they built gigantic mirrors to reflect daylight downwards.

Cheetahs have “tear marks” that run from the inside corners of their eyes down to the outside edges of their mouth. These marks help reflect the glare of the sun when they are hunting during the day. They work just like the black marks that football players put under their eyes during the games. These marks also work like the sights on a rifle, to help the cheetah “aim” and stay focused on their prey when they are hunting.