Generally, you don't want an explosion anywhere near your body. But in the name of science, Destin Sandlin of "Smarter Every Day" used a transparent potato gun as a combustion chamber, which allowed him to set off explosions that he could hold in his hands.
He filmed the blasts at 20,000 frames per second, and the resulting slow-motion footage offered an incredible look at how explosions work.
The close-up view is even more stunning:
And then there's this incredible shot:
Check out the clip above for a full explanation of how it all works. As Sandlin said, "Science is about to happen!"