Behold the naked mole rat. And naked mole rats—while not exactly interested in taking selfies for their latest sponsored post—produce a lot of it. Naked mole rats owe much of their longevity and perpetual youth (by mole rat beauty standards anyway) specifically to high-molecular-mass hyaluronic acid, or HMM-HA. HMM-HA is not synthesized in naked mole rats until after birth, since it’s incompatible with the super-fast proliferation of cells in developing embryos. “These findings demonstrate that evolutionary adaptations found in long-lived species such as the naked mole rat can be exported and adapted to benefit human health,” Gorbunova.