BROADCASTS.com

Episode 029\n \nGot the blues? Well, someone who's really blue -- but likes it -- is the cobalt blue tarantula. This large spider gets its color not from a pigment, but from tiny structures in its hair, which cause the reflected light to display an effect called interference. The same interference effect causes soap bubbles, opals, and butterfly wings to display many different colors depending on what angle you view them from. What is remarkable about the cobalt blue tarantula is that the color doesn't change in this way, but stays the same.