His blood could boil. His lungs could overinflate. The vessels in his brain could burst. His eyes could hemorrhage.

And, yes, he could break his neck while jumping from a mind-boggling altitude of 23 miles.

But the risk of a gruesome death has never stopped "Fearless Felix" Baumgartner in all his years of skydiving and skyscraper leaping, and it's not about to now.

Watch his test jump below.

Full story here:
http://www.foxnews.com/science/2012/10/01/one-week-until-skydiver-aims-for-sound-barrier-in-23-mile-high-free-fall/