Lightning is the single greatest natural force on the planet. Striking the ground 100 times every second, it has killed 8,000 Americans in the last 50 years and causes over $2 billion worth of damage each year. It is the second biggest weather killer in the U.S., with only floods claiming more lives. Lightning travels at 60,000 miles a second and hits the Earth at 55,000 degrees Fahrenheit, five times the temperature of the surface of the sun. Just one lightning strike contains 100,000,000 volts of electricityand it only takes 120 volts to kill a human. Learn how this awesome power source is generated in the atmosphere. Watch a NASA fighter plane fly into a violent thunderstorm to learn exactly what happens when an aircraft is struck. And meet some of the lucky few who have been hit by lightning and survived.