Thank you so much for coming in to talk to us today. My first question is about the way we tend to imagine that the behaviors and habits that are "most healthy" for humans should reflect how we lived while we were evolving — roughly 100-50 thousand years ago. In Paleofantasy, you do a great job debunking this idea.

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Ask biologist Marlene Zuk anything you want about human evolution

Marlene Zuk is an evolutionary biologist, and the author of the new book Paleofantasy: What Evolution Really Tells Us About Sex, Diet, and How We Live. It's a cogent and funny look at common myths about human evolution. Today she's here from 12-1 PM Pacific Time to talk to you about evolution.

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The Ring Nebula, a massive cloud of gas around a dying star, is one of the best-known celestial objects. Not only is it gorgeous, but it's easy to find in a telescope, even if you're an amateur. This new Hubble image is anything but backyard astronomy, however — and it's given astronomers a new understanding of the nebula's shape in space.

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