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.
People who have early onset Alzheimer's may be in any stage of dementia â early stage, middle stage or late stage. The disease affects each person differently and symptoms will vary. If you are experiencing memory problems: 1  Have a comprehensive medical evaluation with a doctor who specializes in Alzheimer's 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.