A cat's urine glows under a black light. See more

In ancient Egypt, killing a cat was a crime punishable by death. See more

The average person spends 2 weeks of it's life waiting for a traffic light to change. See more

A cat has 32 muscles in each ear. See more

The hairs on a polar bear are not white, but clear. They reflect light, so they appear white. See more

The light from your computer screen streams at you at almost 186,000 miles a second. See more

After billions of years, black holes become white holes and they spit out all the things they sucked up. See more

Bees can see ultraviolet light. See more