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How Effective Are School Lockdown Drills?

Since the 1999 Columbine High School shooting, a generation of American children has learned how to hide from a potential shooter. But there’s little data on what kinds of drills work best.

A Promising Anti-HIV Drug Poses A Dilemma

The medication is very effective, but there’s concern it might cause birth defects if taken by a pregnant woman. Different countries address that issue in very different ways.