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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

There are thousands of gun shows in the U.S. each year. Swat meat-type gatherings where the cellars tables are covered in guns, ammunition, accessories, and books.

Just as varied as the wares are the laws that govern what's legal at the shows.

California requires background checks for all buyers,

even when purchasing guns from private citizens rather than licensed dealers.

Nevada does not.

So researchers treated the situation as an inadvertent experiment.

They tracked gun deaths and injuries in California communities

within a couple hours' drive of the Nevada border,

before and after hundreds of gun shows in the two states. And they saw no increase in deaths or

injuries in the weeks following California gun shows. But after shows in nearby Nevada, the number

of hurt and killed citizens in those same California communities climbed 70% compared to pre-gun show levels.

That translates to 30 additional deaths and injuries in those California zip codes during the

decade-long study period. If we extended this study nationwide, it's possible that the number

of deaths and injuries associated with gun shows could really add up.

Ellicott Mithae, an epidemiologist at UC Berkeley who led the study.

Her team's analysis appears in the annals of internal medicine.

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