Ischemia is when there is a blockage of blood flow to a part of the body. Ischemia can lead to serious problems like heart attack and stroke. Risk factors for ischemia include poor circulation, high ...

A 16-year-old boy lifts a Volkswagen off his pinned neighbor. A mother fights off a polar bear to protect her children. A daughter heaves an overturned tractor from atop her father. These feats are ...