Science & Technology

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The first time he encountered a tiger shark in the water, marine ecologist Neil Hammerschlag was in the Bahamas conducting research. His team was on a boat and hadn't seen many sharks, so when someone yelled, "Tiger shark!" he grabbed his snorkel gear and camera and jumped into the water.

"One [tiger shark] moved right in toward me and came close," Hammerschlag tells Fresh Air's Dave Davies. "It opened its mouth, and I was looking through its mouth down its gut and seeing its gills from the inside."

For parents concerned that their preschoolers may one day gain excess weight, a study published Thursday suggests one strategy for keeping the little ones on track that isn't related to food: Tuck them in earlier.

Scientists reporting online in The Journal of Pediatrics found, in a study of not quite a thousand U.S. children, that preschoolers who got to bed by 8 p.m. were about half as likely as those who turned in after 9 p.m. to develop obesity in their teenage years.

Updated at 11:32 a.m. ET to reflect a recent ruling in the Facebook v. Power Ventures case.

People share passwords all the time. A husband might give his wife his bank account login so she can pay a bill. A professor might ask a secretary to check emails. Comedian Samantha Bee's segment on Syrian refugees featured her teaching them essential phrases in U.S. culture, including "Can I have your HBO Go login?"

After more than a week of violence and racial tension sparked by the deaths of black men at the hands of police and the shooting deaths of five officers in Dallas, we're getting more perspective from African-American law enforcement officials. We wanted to know how black officers, folks who find themselves right in the middle of heated conversations about race and policing, are processing everything that happened.

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