
Snoozing cats may lose an awful lot of their day to sack time, but they may be on to something. A Greek study published in the Archives of Internal Medicine this year showed that people who nap at least three times a week for at least 30 minutes are 37% less likely to die from heart disease. Another study, published in the online edition of the Journal of Applied Physiology, provided a possible reason: blood pressure eases in the time just before sleep. The coronary value of a siesta, however, is still questionable. Researchers have yet to explore whether blood pressure rises upon waking from a nap. Snoozing certainly isn't a guarantee against getting heart disease, but the studies do provide an excuse for half an hour of downtime.
Morality and empathy are writ deep in our genes. Alas, so are savagery and bloodlust. Science is now learning what makes us both noble and terribleand perhaps what can make us better
Here are some of the dilemmas used to study human morality. Take this quiz to see how you compare to other TIME.com readers
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