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Every day, Dr. Walter Koroshetz, 65, takes a pill as part of his effort to help keep his brain healthy and sharp.

The pill is his blood pressure medication. And Koroshetz, who directs the National Institute of Neurological Disorders and Stroke, says controlling high blood pressure helps him reduce his risk of dementia.

He also keeps his blood pressure down by exercising, and paying attention to his weight and diet. "I'm a believer," he says.

Can't cool off this summer? Heat waves can slow us down in ways we may not realize.

New research suggests heat stress can muddle our thinking, making simple math a little harder to do.

A new film about Robin Williams begins with his appearance on Inside the Actors Studio with James Lipton. Lipton says: "How do you explain the mental reflexes that you deploy with such awesome speed? Are you thinking faster than the rest of us? What the hell is going on?" Williams first makes a goggle-eyed face, but then he falls over sideways, like an embarrassed kid, curling up and cackling. And then, of course, he does precisely the thing Lipton is asking about: a flurry of movements, voices, bits, fragments of thoughts flying by — fragments riffing on his own thinking.

Updated at 9:35 a.m. ET

President Trump met with Russian President Vladimir Putin on Monday, just days after an American grand jury indicted 12 Russian intelligence officers on charges related to Russia's interference in the 2016 election.

The meeting, in Helsinki, was the first stand-alone summit between the two leaders.

Trump and Putin met privately for about two hours before being joined by their aides for a working lunch.

Entrepreneur Elon Musk and a British diver who helped rescue a dozen boys and their soccer coach from a cave in Thailand last week are engaged in a public spat over the specially designed mini-submarine that Musk offered to rescuers but was never used.

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And finally today, we are going to hear more about the creative life of Robin Williams. He is the subject of a new HBO documentary airing tomorrow night called "Robin Williams: Come Inside My Mind."

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As the #MeToo movement has spread, more and more women - and some men - have been coming forward from more and more workplaces and other institutions to share their stories and to demand change.

Updated at 6:36 p.m. ET

Protests in Chicago escalated on Saturday night, becoming a tense clash between demonstrators and police over the fatal shooting of a man on the city's South Side.

On Sunday, police released a 30-second video clip from an officer's body-worn an camera showing a black man shot by Chicago police had a gun in a holster at his hip. According to The Associated Press, the man was "running away and reaching toward his waist when he was shot multiple times."

France is the champion of the 2018 FIFA World Cup Final, besting Croatia by 4 goals to 2.

France entered the tournament as a favorite, powered by stars such as Kylian Mbappe and Antoine Griezmann, while Croatia was seen as a longshot for victory.

"We are world champions and France are going to be on top of the world for next four years," French coach Didier Deschamps said after the game. He called the tournament a "beautiful celebration of football."

Novak Djokovic won the Wimbledon men's singles title for the fourth time on Sunday, defeating South African's Kevin Anderson.

It wasn't a short championship for either competitor – on Friday in the semi-finals Kevin Anderson and John Isner played a remarkable six and a half hour match. That marathon match, in turn, forced Djokovic to play Rafael Nadal over the course of two days, and delayed the women's finals.

President Trump has said he has "low expectations" ahead of a summit with Russia's Vladimir Putin, and added that he sees the European Union as a "foe" of the U.S.

He made the comments in an interview with CBS that aired on Face the Nation, during a visit to Europe that has tested relations with some of the U.S.'s most important allies.

Protesters dominated the scene in London this week during President Trump's visit to the United Kingdom.

But many in the U.K. are hopeful that any tension in the "special relationship" between both countries is temporary – especially business owners.

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