It’s scary and mind-blowing to think about, but tiny parts of us are constantly dying. Our skin, hair, and finger nail cells are dying every second. We are also constantly creating and dividing new cells as well. The problem is, we’re not perfect. Every time our cells divide there are mistakes. Sadly, some of these mutant mistakes literally grow out of control into cancer. Michael of Vsauce covers this topic in his new video and explains why some people get cancer, and some don’t.