Can a computer program craft passable prose — something readers can't distinguish from human-authored stuff? How about poetry, or dance mixes? New contests pose those challenges.
Tigers have round pupils, but domestic cats have vertical slits in the center of their eyes. What gives? A census of the shapes of animals' pupils suggests size and way of life each play a big role.
We're not talking steroids here, we're talking about the stuff you can buy at the supermarket. They're not dangerous in themselves. But overuse can signal emotional or physical problems.
Also this week, an in-depth look at Darren Wilson — the Ferguson, Mo., police officer who fatally shot Michael Brown.
A psychologist says there could be a simple way to make calorie-packed foods like French fries or ice cream seem unappealing, even a bit disgusting. Others are less sure.