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Diagnosing attention deficit hyperactivity disorder can be difficult. The symptoms of the disorder, as defined by the Diagnostic and Statistical Manual, or DSM, have changed multiple times.

Even if you know what to look for, many of the symptoms are pretty general, including things like trouble focusing and a tendency to interrupt people. Discerning the difference between people who have a problem and those who are just distracted requires real expertise.

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

Sharks have been swarming around southern California beaches for weeks. NPR wanted to know more about why, so we placed a call to Chris Lowe, a professor in marine biology and head of the Shark Lab at California State University at Long beach — or rather, we tried. Lowe was offshore on a boat trapping sharks to tag, and at the appointed time for our interview, Lowe had his hands full ... of shark.

Dr. Mark Sklansky, a self-described germaphobe, can't stop thinking about how quickly microbes can spread.

"If I am at a computer terminal or using a phone or opening a door, I know my hands are now contaminated, and I need to be careful and I need to wash my hands," says Sklansky, a professor of pediatrics at the David Geffen School of Medicine at UCLA.

North Korea fired a short-range ballistic missile off its east coast on Monday into the Sea Of Japan, South Korean and Japanese officials say, its ninth launch this year.

The South's Joint Chiefs of Staff described it as a Scud-type missile which flew for some 280 miles, NPR's Jihye Lee tells our Newscast unit, from Seoul.

"The military is saying that the launch took place from Wonsan, home to a test site of intermediate-range missiles," Lee reports.

The Associated Press adds:

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MICHEL MARTIN, HOST:

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

MICHEL MARTIN, HOST:

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