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The Dow Jones industrial average on Tuesday topped 23,000 for the first time, crossing another milestone amid better-than-expected earnings reports and concerns that stocks are approaching another bubble.

The Dow finished above 22,000 for the first time on Aug. 2.

With its new record level, the blue chip index is now up 16 percent since the start of the year and about 26 percent since Election Day.

People who have obsessive-compulsive disorder can get trapped inside a thought. It repeats itself, like a stuck song. Did I lock the door? Is that doorknob is clean enough to touch? I better wash my hands again – and again.

The biology underpinning this loop remains murky to scientists, but scientists are beginning to sniff out potential genetic factors behind OCD and shed light on how the disorder affects the brain.

Rep. Tom Marino, R-Pa., has withdrawn his name from consideration as America's drug czar, President Trump said Tuesday. Marino is stepping back days after reports that legislation he sponsored hindered the Drug Enforcement Administration in its fight against the U.S. opioid crisis.

Updated at 11:40 a.m. ET

The U.S.-backed Syrian Democratic Forces are in the process of kicking ISIS out of Raqqa, the extremist group's self-declared capital where it has terrorized civilians and plotted attacks against targets linked to the U.S. and its allies. Now ISIS fighters are reportedly bottled up in a stadium complex in the Syrian city.

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

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

One-third of all the food produced each year for human consumption is never eaten. That adds up to about 1.3 billion tons of waste per year. That unappetizing fact is the inspiration for a new documentary, Wasted! The Story of Food Waste, which was released on Oct. 13 in theaters and on demand.

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

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

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