Making gun buyers wait a few days before receiving a newly purchased firearm could keep 910 people across the US from being killed with a gun each year, a new study says. The research supports enacting a nationwide waiting period between buying and receiving a gun; in the states that already do this, guns appear to be killing fewer people.

The recent mass shooting in Las Vegas that killed 59 people is a wrenching reminder that every year, roughly 33,000 people in the US are killed by guns. That’s as many as people killed by car crashes, and it’s a bigger proportion than in any other developed country. A team of researchers led by graduate student Christopher Poliquin at Harvard Business School wanted to find out whether making people…

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