13 Signs You in Love

13 Scientifically Proven Signs You're in Love

By: Life's Little Mysteries Staff

Date: 10 February 2012 Time: 01:24 PM ET

Valentine's Day is approaching. You have a Valentine…but are you really in love with him or her? With your head spinning from all the heart-shape chocolates and red roses, it can be tough to figure out. Fortunately, scientists have pinned down exactly what it means to "fall in love."

Frogs are Green

 Why Frogs are Green

Corey Binns

Date: 02 April 2006 Time: 08:48 PM ET

Kermit the Frog often said being green isn’t easy. He had no idea how complex it really is.

Three types of pigment cells, called chromatophores, work together to make a frog green.

The chromatophores stack on top of each other.Melanophores make up the bottom layer. They contain melanin, a pigment that appears dark brown or black. Melanin also tints human skin.