How a 43,000-Year-Old Wooly Mammoth Could One Day Save Your Life

Heart and brain surgeries are called "hypothermia-dependent" procedures because doctors often have to lower their patients' temperatures during surgery. The thing is, human blood doesn't transport oxygen as well at cold temperatures. Surgeons rely on synthetic blood substitutes to help the patient's body cope. » 9/14/11 1:18pm 9/14/11 1:18pm