There are two in there that I was concerned about, but I checked the links to the original videos and in one it was about 180000 dollars worth of sugary and in the other the guy stands up immediately after hitting.

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138 skydivers in formation while upside down

Clearly she is not epileptic

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Fucking hell that's cool. It's not often my heart beats faster when I watch a youtube video.

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Ski jumpers do it too, but with less airspeed:
http://www.youtube.com/watch?v=pfk8Nh-IBoI

Anything can produce lift (anything that isn't a sphere), some shapes are just more efficient than others. With practice, you kind of turn your body into an airfoil shape and with the perfect angle, enough speed and inflatable baggy pants you can get about a 1.4 glide ratio (1.4 meters forward for every meter downward).

It's an incredible feeling that is completely different from wing suits because your movement isn't restricted at all.

*FTW - the hang time they get on that thing is incredible.

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