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Dehydration has long been known to slow physical performance. Now there's evidence that too little water can hurt cognitive performance, too, making complex thinking tasks harder.

People in Ellicott City, Md., are surveying the damage to their homes and businesses after a historic flash flood raged through the city — the second in as many years. NPR's Mary Louise Kelly talks with Mark Hemmis, whose restaurant Phoenix Emporium was badly damaged back in 2016 and again on Sunday.

Linguist Geoff Nunberg believes there's value in writing by hand — but he doesn't see why the letters have to connect. "You may as well dictate what song we all have to sing in the shower," he says.

Here are a few of the messages delivered by globally-minded speakers to members of the Class of 2018.

Guns are the most common method used for suicide, accounting for the deaths of almost half the people who kill themselves, a Centers for Disease Control and Prevention study finds.

Restaurateur and cookbook author Mildred "Mama Dip" Council has died in Chapel Hill at the age of 89. For more than four decades, people have made pilgrimages to her restaurant, Mama Dip's Kitchen, to taste good, simple food and sometimes find surprises on the menu.

The court decided only the accused have a right to profess guilt or innocence, not a lawyer. And in the age of Zipcar, you still maintain a right to privacy even if you aren't on a rental agreement.

Michael Horowitz, the Justice Department's inspector general, took questions Tuesday from lawmakers about the voluminous report his office released last week.

Rose, 17, was shot dead after fleeing a traffic stop last week, sparking days of protest. Officer Michael Rosfeld, 30, was arrested and charged on Wednesday and released after posting bail.

Critics say the Trump administration failed to properly vet Dr. Robert Redfield. Sen. Patty Murray says a past research controversy suggests a "pattern of ethically and morally questionable behavior."

The Children's Health Insurance Program drew bipartisan support for two decades. After brinkmanship over the federal budget, an agreement to end the shutdown has assured CHIP funding for six years.

NPR's Ailsa Chang speaks with Alissa Walker, urbanism editor of Curbed, about the 80 percent rise in pedestrian deaths in Los Angeles since the mayor launched his initiative to eliminate traffic fatalities two years ago. This comes as pedestrian deaths nationwide are at a 33-year high.

Michael Avenatti, the lawyer representing Stormy Daniels — the adult film actress alleging to have had an affair with President Trump in 2006 — talks about the upcoming legal case. Daniels, whose given name is Stephanie Clifford, is suing Trump to overturn a confidentiality agreement for which she was paid $130,000.

California's legislature will soon take up a bill requiring doctors to screen new mothers. Many doctors oppose the idea, and similar laws elsewhere haven't increased the number of moms treated.

Researchers say hospitals are missing an opportunity to help people with opioid addiction get into treatment by not doing enough when they show up in emergency rooms after an overdose.

Gas stations were packed and long lines for water and plywood formed as residents made preparations for the storm to strike the Florida coast.

North Korea has so far tested its missiles and its nukes separately. But some experts worry Pyongyang may decide to put the two together into a single test.

Because of floodwaters from Hurricane Harvey, the plant lost power — and the ability to keep containers of flammable organic peroxides from bursting and burning, according to Harris County officials.

A new study shows that women think more highly of female lawmakers, and that for men, there's no difference. But broken down by party, the results get more complicated.

The Virginia city "protected neither free expression nor public safety on August 12," says the report, an unsparing record of the chaos that unspooled in protests by right-wingers and their opponents.