Badwater Ultramarathoners test will power in extreme weather

Shannon Farar-Griefer, 52, of Hidden Hills, California, (L) is given water by her team as she competes in the Badwater Ultramarathon in Death Valley National Park, California July 15, 2013. The 135-mile (217 km) race, which bills itself as the world's toughest foot race, goes from Death Valley to Mt. Whitney, California in temperatures which can reach 130 degrees Fahrenheit (55 Celsius). [Photo/Agencies]