Alzheimer's has one of the biggest research funds of any disease out there, and for good reason. It affects many, and is devastating not only for the people suffering from it, but those who love them. Now, scientists are finding evidence that it could be spread through a simple blood transfusion. Researchers have suspected for a long time that more than genetic factors are at play.

If returning the Greater Yellowstone Ecosystem's native species is truly a priority, the nation's first national park would be teeming with more than grizzly bears, wolves and huge bison with prehistoric genes. There also would be a thriving population of giant mammoths calling the ecosystem...

Dr. Marc Siegel reacts to what is behind rising cancer cases among young adults and advises to eat a healthy diet, cut back on alcohol consumption, and get the HPV vaccine Almost 40% of Americans will receive a cancer diagnosis at some point in their lifetime — but certain types are more common...