- Limestone (Wikipedia)
Limestone (calcium carbonate CaCO3) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of CaCO3. Limestone forms when these minerals precipitate out of water containing dissolved calcium. This can take place through both biological and nonbiological processes, though biological processes, such as the accumulation of corals and shells in the sea, have likely been more important for the last 540 million years. Limestone often contains fossils which provide scientists with information on ancient environments and on the evolution of life.
- Matthew Shepard (Wikipedia)
Matthew Wayne Shepard (December 1, 1976 – October 12, 1998) was a gay American student at the University of Wyoming who was beaten, tortured, and left to die near Laramie on the night of October 6, 1998. He was taken by rescuers to Poudre Valley Hospital in Fort Collins, Colorado, where he died six days later from severe head injuries received during the attack.