This Week on Science Seen

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Kissing Cousins

Sex may be mostly private, but sometimes clues can tell you that a couple has got something going on. That’s not unusual. But here’s a story of ancient history coming to life that is unusual. It’s about an interspecies coupling of a Homo sapiens and a Homo neanderthalis forty thousand years ago, and of how […]

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The Coincidence Problem

Sean Carroll has remarked on the remarkable coincidence that today’s universe is equal parts energy and matter. That is, matter and vacuum energy densities are approximately equal to each other. As he puts it: “At early times the vacuum energy was negligible in comparison to matter and radiation, while at late times matter and radiation […]