Naked mole rats live approximately 30 years, which doesn’t seem too big of a feat to humans, but compared to the rest of the animal kingdom, this is an exceptionally long time. What’s also impressive is that these mole rats pretty much stay healthy until the end of their lives. Reports even say that this species is cancer-proof. So what’s their secret? According to new research conducted by biologists at the University of Rochester, better-constructed proteins provide the key to this species’ longevity.