Base jumping is the sport of using a parachute to jump from fixed objects.  Felix Bumgartner, with the help of Redbull, recently broke the world's base jumping record. He astonished the human race by jumping from 128,000 feet, traveling 833 mph and breaking the sound barrier.  

But he couldn't have done it if these other jumpers hadn't laid some groundwork.

Jeb Corliss: Corliss created a video called "Grinding The Crack," named for the Swiss gorge he flies through in his squirrel suit.  He's a human arrow, screaming through the air at 122 mph!

Lion Hearts: In a video made by Starbuck's, base jumpers from around the world gather every year to leap off the KL Tower in Malaysia.  Starbuck's has signed on as the sponsor, but how much caffeine do you need when you're flying off the edge of a building?

Matthias Giraud: Giraud and his Go Pro Hero 2 camera travel to the gorgeous, unspoiled beauty of Iceland.  His landings aren't always pretty, but his leaps and the surrounding scenery make him one of our favorite flyers.