The cost of raising a child from birth to age 18 is around $233,610. St. Elmo's fire, the phenomenon in which a pointed object has a violet or blue glow thanks to electricity in the air, is actually a form of plasma. The Guiness World Record for smallest dog is held by a 3.8 inch tall Chihuahua named Milly. Pope Gregory IX was apparently a dog person, because he tried to exterminate all cats from Europe. There are roughly 1.5 billion bugs for every one person on the planet! They're more essential to most of our ecosystems than humans. Cold water and hot water sound different when they're being poured, because heat changes the viscosity of the water.