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Do you remember the day you decided you were no good at math?

Or maybe you had the less common, opposite experience: a moment of math excitement that hooked you for good?

Thousands of studies have been published that touch on the topic of "math anxiety." Overwhelming fear of math, regardless of one's actual aptitude, affects students of all ages, from kindergarten to grad school.

Many of President Trump's immigration policies are deeply unpopular, including recent efforts to deter illegal immigration by separating migrant families at the border, according to a new NPR-Ipsos poll.

But Americans are polarized in their attitudes about immigrants and the U.S. system for admitting them, the polls shows, with Republicans much more likely to support the president's policies, including the travel ban, the border wall, and changes to legal immigration.

When it comes to immigration policy, American opinions often break down along party lines, with most Republicans supporting President Trump's views and Democrats vigorously opposed.

But according to a new NPR-Ipsos poll, there is an even better predictor of how you feel about immigration: where you get your TV news.

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.

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.

Copyright 2018 NPR. To see more, visit http://www.npr.org/.

Copyright 2018 NPR. To see more, visit http://www.npr.org/.

Copyright 2018 NPR. To see more, visit http://www.npr.org/.

Updated at 1:38 p.m. ET

In a remarkable press conference, President Trump did not attempt to contradict Russian President Vladimir Putin's denials that Moscow interfered with the 2016 election.

Trump said he had great confidence in the U.S. intelligence community, but also said all he could do was ask Putin about Russia's actions and pointed reporters to what he called Putin's "strong and powerful" denials.

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.

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