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By Lindsey Tanner The Associated Press

Marijuana’s 4/20 holiday tied to rise in fatal car crashes

CHICAGO — Marijuana users’ self-proclaimed holiday is linked with a slight increase in fatal U.S. car crashes, an analysis of 25 years of data found.

The study lacks evidence on whether pot was involved in any of the April 20 crashes, but marijuana can impair driving ability. Previous studies have shown that many pot-using motorists drive after partaking and think it’s safe to do so.

Rise in teen suicide, social media coincide; is there link?

CHICAGO — An increase in suicide rates among U.S. teens occurred at the same time social media use surged and a new analysis suggests there may be a link.

Suicide rates for teens rose between 2010 and 2015 after they had declined for nearly two decades, according to data from the federal Centers for Disease Control and Prevention. Why the rates went up isn’t known.

Trump calls attackers ‘deranged’ but mental health link weak

CHICAGO — President Donald Trump called the Texas church shootings gunman “deranged,” the New York bike path attacker “a very sick and deranged person,” and the Las Vegas massacre shooter “a sick, demented man.”

It’s a common reaction to mass violence who in their right mind would commit these senseless crimes? The truth is more nuanced.

Brain disease seen in most football players in large report

CHICAGO — Research on 202 former football players found evidence of a brain disease linked to repeated head blows in nearly all of them, from athletes in the CFL, NFL, college and even high school.

It’s the largest update on chronic traumatic encephalopathy, or CTE, a debilitating brain disease that can cause a range of symptoms including memory loss.

Drones carrying defibrillators could aid heart emergencies

CHICAGO — It sounds futuristic: drones carrying heart defibrillators swooping in to help bystanders revive people stricken by cardiac arrest.

Researchers tested the idea and found drones arrived at the scene of 18 cardiac arrests within about 5 minutes of launch. That was almost 17 minutes faster on average than ambulances a big deal for a condition where minutes mean life or death.