The standard technique of treating burn is slow - so slow that many burn patients die from infections before their skin can regenerate.
Enter Dr. Jörg C. Gerlach. He developed the Skin Gun, which sprays stem cells and heals severely burned skin in just a few days. It seems like science-fiction, but it really works.
Buzzfeed has the fascinating video clip, but be forewarned: it's not for the squeamish. Link