The National Bureau of Economic Research says math scores are down 14 percentage points on average, though the figure varies by state.
EDITORIAL: Public sector unions have become Democratic Party's most powerful tool
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In 2011, the National Bureau of Economic Research published a paper that said being hit by a vehicle with an added 1,000 pounds increases by 47% the probability of being killed in a crash.
U.S. official warns of risks posed by heavy electric vehicles
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