You're hurtling toward the ground at more than 120 miles per hour (200 kilometers per hour). Your ears are roaring with the sound of the wind as you fall. Maybe your mind registers the terror of your situation, or maybe a calm comes over you and that Tom Petty song comes into your head. Either way, it's time to focus: You don't have much time to figure out how to save yourself.
The odds of surviving a free fall without a parachute are pretty slim, but it's been done before. In the extremely unlikely chance that you find yourself in that situation, here's what you need to know.