“Humans age gradually, but some animals do all their aging in a rush at the end of life, while others don’t age at all, and a few can even age backward. The variety of aging patterns in nature should be a caution sign to anyone inclined to generalize — particularly the generalization that aging is inevitable.” In Nautilus, Josh Mitteldorf and Dorion Sagan explain why aging isn’t inevitable. (It’s like I always say. Age ain’t nothing but a … hmmm, what was that saying?)

+ And much more in Nautilus’ aging issue.