
Cardiac doctors experienced their own heartbreak last year when a promising new compound that increases HDL, or good cholesterol, turned out to increase blood pressure and risk of death from heart disease. They had hoped that torcetrapib, made by Pfizer, could be combined with cholesterol-lowering statins to help cut the amount of fatty plaque in arteries by exploiting HDL's ability to vacuum up bad cholesterol. That may still happen, since a new study showed torcetrapib indeed raised HDL levels 60% and slowed the buildup of plaque in the arteries. Now the race is on to figure out how to accomplish this without boosting blood pressure to dangerously high levels.
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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