Blue Facts

Lobsters have blue blood.

Water is actually naturally blue.

Blue eyes are the most sensitive to light, dark brown the least sensitive.

Facebook is blue because Mark Zuckerberg is red-green color blind. Blue is the color that comes through clearest for him. "Blue is the richest color for me - I can see all of blue," he told The New Yorker in 2010. One man's biology shaped the look of a platform used by about 3 billion people.

While pumpkins are typically orange, they can also be green, white, red, gray, and even blue.

In zero gravity, a candle's flame is round and blue.