A to Z Health Guide 2007

Science

What Makes Us Moral

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 terrible—and perhaps what can make us better

Interactive

The Morality Quiz

Here are some of the dilemmas used to study human morality. Take this quiz to see how you compare to other TIME.com readers

A-F

From Autism to Flu

G-M

From Gardasil to Migraines

N-S

From Naps to Suicide

T-Z

From Tuberculosis to Zoledronic Acid