April 16, 2014

Researchers have discovered yet another benefit of exercise: It not only helps skin look younger, but may even reverse skin aging in those who begin exercising later in life.

According to The New York Times, scientists at McMaster University in Ontario, Canada, found that mice who were bred to age prematurely became frail and demented and lost their fur when they remained sedentary. Mice that had access to running wheels had an opposite response: They maintained healthy hearts, muscles, brains, and reproductive organs, and their fur never turned gray.

Researchers then turned to humans. They tested the skin samples of 29 volunteers — males and females, between the ages of 20 and 84 — and had half perform at least three hours of moderate or vigorous physical activity a week, while the others exercised for less than an hour each week. After taking samples of skin, researchers discovered that the men and women older than 40 who exercised frequently had a thinner and healthier stratum corneum (the part of the skin you see and feel) and thicker dermis layer, which looked more like that of a 20-something.

Scientists are still trying to figure out how exercise changes the skin composition, but they did discover that the skin samples of those who exercised more had high levels of a myokine — a substance created by active muscles that enters the bloodstream and starts changes in cells — called IL-15. While they still don't have all the answers, researchers are amazed by what they've discovered so far. "It is astonishing to consider all of the intricate ways in which exercise changes our bodies," says Dr. Mark Tarnopolsky, a professor of pediatrics and exercise science at McMaster who oversaw the study. Read more about the research at The New York Times. Catherine Garcia

2016 Watch
1:44 p.m. ET

Sen. Rand Paul (R-Ky.) has run a presidential campaign plagued by low poll numbers, weak fundraising efforts, and lackluster debate performances. Recently, he's been pouring more fundraising energy into his Senate re-election bid, which he's running simultaneously to his effort to win the Republican presidential nomination.

But Paul insisted he's not going anywhere in a Sunday interview on Fox News' Media Buzz.

"I think the rumors of my demise are somewhat exaggerated, to say the least," he said.

Paul also took a shot at Republican frontrunner Donald Trump, who predicted Paul's downfall in a September tweet.

"We run a tight ship around here," Paul said. "We plan on being in for the long hall, and I think ultimately celebrity will sort of filter out of this."

Watch Paul's full interview here. Julie Kliegman

Israel and Palestine
1:10 p.m. ET
Musa Al-Shaer/AFP/Getty Images)

Israeli authorities banned Palestinians — including Jerusalem residents — from entering the capital's Old City on Sunday, The New York Times reports.

The only exception to the ban was reportedly for Palestinians who wanted to worship at the Al Aqsa Mosque, where men under 50 are not typically allowed.

About 3,500 police officers in Jerusalem closed off some of the capital's Arab neighborhoods Sunday. The move came after the second deadly Palestinian attack on Israeli families in three days, where two ultra-Orthodox men were fatally stabbed. Julie Kliegman

squad goals
12:34 p.m. ET

The bad blood between pop stars Taylor Swift and Miley Cyrus might run even deeper than previously thought. When Cyrus hosted Saturday Night Live, the show devoted a whole segment to relentlessly mocking her colleague's ever-growing squad.

On her 1989 tour, Swift has garnered attention for a mile-long list of invitations for celebrities to join her on stage: Lena Dunham, Uzo Aduba, Julia Roberts, Keith Urban, and Kobe Bryant, to name a very small fraction.

In a post-apocalyptic sketch that feels way too real, SNL dared to imagine what will happen when everyone forcibly joins Swift's cult.

Vanessa Bayer woke up in a dark, dark world where the few remaining survivors live in constant fear of being abducted to join Swift on stage.

"First it was the models. And then the athletes," a distraught Kenan Thompson said, moments before his own abduction. "Then it was everybody."

Watch your imminent demise unfold below. Julie Kliegman

lgbt rights
11:27 a.m. ET
Leigh Vogel/Getty Images

Vice President Joe Biden said transgender people should be able to serve openly in the military, a stance that goes beyond anything the Obama administration has said before, The Associated Press reports.

"It's simple," Biden said at the Human Rights Campaign gala Saturday night. "All Americans are qualified to serve, should be able to serve."

In July, Defense Secretary Ash Carter ordered a review of the policy banning transgender people from service.

Biden is known for supporting LGBT rights more vocally than other prominent Democrats. In 2012, he backed same-sex marriage before President Obama and Hillary Clinton did.

The vice president, who is still deciding whether to enter the 2016 race, also used the keynote as a chance to slam his would-be Republican opponents.

After noting how far the U.S. has come in supporting LGBT rights, Biden added a wry caveat: "There's homophobes still left — most of them are running for president." Julie Kliegman

School Shootings
10:56 a.m. ET

Republican frontrunner Donald Trump doesn't believe stricter gun control would result in fewer mass shootings, he said Sunday on NBC's Meet the Press. In fact, he thinks more guns could be the answer to stop gunmen like Christopher Harper-Mercer, who fatally shot nine people at an Oregon community college Thursday.

"I can make the case that if there were guns in that room other than his, fewer people would've died, fewer people would've been so horribly injured," he told Chuck Todd.

Both on NBC and in a similar interview on ABC's This Week, Trump blamed gun violence on mental illness.

"No matter how you cut it, you have people that are mentally ill, and they have problems and they're going to slip through the cracks," he told ABC's George Stephanopoulos.

In fact, only 4 percent of U.S. violence can be linked to people diagnosed with mental illness, according to a 2015 American Journal of Public Health report debunking the exaggerated role some believe mental illness plays in mass shootings.

Watch Trump's Meet the Press comments below and check out his This Week interview here. Julie Kliegman

the new boehner
9:32 a.m. ET
Brendan Smialowski/AFP/Getty Images

Rep. Jason Chaffetz (R-Utah) formally announced his bid for House speaker in a Fox News Sunday interview.

He'll be up against Majority Leader Kevin McCarthy, who is favored to take over when John Boehner steps down Oct. 30.

"The American people want a fresh face and a fresh new person," Chaffetz said.

Chaffetz, who chairs the House Oversight Committee, told Politico he would treat the position as a facilitator.

"I'm not here to be a dictator, but to empower members to do what they see fit," he said. "I want the process to work its way through the body." Julie Kliegman

she's probably still a robot though
8:29 a.m. ET

In her latest attempt to convince voters she isn't a humorless robot, Democratic presidential frontrunner Hillary Clinton took to Saturday Night Live to poke fun at herself.

Clinton played Val, an ordinary bartender, to Kate McKinnon's Clinton, who was feeling down on her 2016 chances. The two acknowledged Clinton took a long time to oppose the Keystone pipeline and support same-sex marriage.

When McKinnon mentioned Trump, the real politician mustered a surprisingly decent Donald voice and said, "Isn't he the one that's like, 'Ugh, you're all losers.'"

To further hit home that she's a good sport, Clinton even tweeted praise of McKinnon's performance:

And for his part, Trump retweeted a supporter who slammed Clinton's performance but complimented Taran Killam's ruthless impression of him, showcased in Saturday's cold open.

Even former President Bill Clinton dropped by (as played by SNL vet Darrell Hammond) to kick off the show's 41st season. Watch it all unfold below. Julie Kliegman

See More Speed Reads