What If You Were the Last Person on Earth?

So you wake up one day and find that you're the only person left in the world. Kind of cool, right? No obligations, no rules, no limits. Go nuts!

Actually, go for the exotic fruits first. If your mangos and bananas are imported from overseas, chances are they'll be hard to get to. So eat them while you can, and enjoy every last bite.

What If asks some of the most provocative hypothetical questions in science — and then tries to answer them with the help of established scientific theory and the latest research.