Today’s interesting fact has to do with the Horseshoe Crab.

The Horseshoe crab is considered a living fossil. Fossils that looks almost exactly like the Horseshoe crab show that an animal with the same body and structure first appeared about 450 million years ago and has hardly changed in all that time, which is far longer than most species of plants or animals, including humans can ever hope to exist.

 The Horshoe crabs blood is blue, because it is based around the copper atom instead of an iron atom.