Thoughts about plants, games, King Arthur, and direct eye contact on public transportation.
Thursday, January 14, 2016
Science Facts: Trilobite Lenses
Nearly all lenses in animal eyes are made of cell tissue and protein. Trilobites (a class of extinct marine arthropods) are an interesting exception: their lenses were made of calcite, a transparent crystal. Trilobites apparently produced these natural eyeglasses by drawing calcium carbonate from seawater and directing it to the eyes.