Tech It Out: How a gel stops bleeding in seconds

Uncontrolled bleeding is a deadly killer. Stabbings, car accidents, penetrating injuries. Once your arteries have been severed, bleeding could be extremely traumatic.
The human body will naturally form blood clots, but it can be too slow to deal with serious injuries. In fact, some injuries can kill you in just five minutes.
How do we stop them quickly in a way that can work with the body?

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