Aging brings about a range of changes—often unwelcome—to our bodies: sagging skin, graying or thinning hair, and a decline in muscle strength and vitality. But aging also affects us on the inside, ...

James is a published author with multiple pop-history and science books to his name. He specializes in history, space, strange science, and anything out of the ordinary.View full profile James is a ...

Giant tortoises are some of the long-lived species on the planet. Here’s what biologists now understand about one of nature’s most impressive longevity experiments. Giant tortoises are redefining what ...

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. Humans, under optimal conditions, can live to an age of 100 ...