Ten million lightening bolts shoot towards Earth every day, each hotter than the sun and miles long, het less than an inch thick. Dangerous and unpredictable, lightning kills 100 Americans peryear and injures 500 more. Meet the survivors, including victims of multiple strikes, and a doctor who studies them. Travel to Florida's Lightening Alley, where scientists trigger lightning strikes to test lightning-proof power supplies. Examine the most advanced lightning protection system in the world - for the Space Shuttle! At a high mountain research station, witness the rare phenomenon of "lightning sprites," which shoot upwards from the tops of clouds to heights of 60 miles. You'll never look at lightning the same way again.