Setting aside the notion of determining the number of individual animals on the planet for a moment, merely determining the number of species on the Earth is challenging. Science has only been able to offer estimates thus far, and totals vary greatly.
A. A. A. Multiple sclerosis, or MS, is a long-lasting disease that can affect your brain, spinal cord, and the optic nerves in your eyes. It can cause problems with vision, balance, muscle control, and other basic body functions. The effects are often different for everyone who has the disease.
Researchers at NYU have made a key step in developing a treatment for Creutzfeldt-Jakob and a host of other brain-wasting diseases. There are currently no treatments for prion diseases, brain-wasting diseases that are invariably fatal. The most common human prion disease is Creutzfeldt-Jakob disease (CJD), better known as mad cow disease. MORE FROM THE DOCTOR: Blood Transfusions Spread Parasite.