Life's Little Mysteries answers fascinating questions about the world around you and the stuff in it, from things in the news and on your mind to crazy questions you didn't even know you had.
Ever notice a gritty film covering your teeth after eating a spinach salad? This phenomenon, called "spinach tooth," happens because the leafy greens are chock-full of oxalic acid.
Owls are so famous for their nighttime escapades, that the phrase "night owl" developed to describe people who stay up late. But the saying is actually a bit misleading because some owls are active daytime hunters, experts told Live Science.