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May 4, 2014
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Two studies published on Sunday show that blood from young mice reversed aging in old mice, rejuvenating both their muscles and their brains, The New York Times reports.

Dr. Saul Villeda at the University of California, San Francisco, and his colleagues discovered that after young mice and old mice were stitched together at their flanks and their blood was flowing through each other, the old mice formed several new neurons in the hippocampus region of the brain, an important area for imprinting memories. The scientists also removed cells and platelets from the blood of young mice and injected the remaining plasma into old mice, which helped the older rodents perform better on memory tests.

Over at Harvard University, Dr. Amy J. Wagers and her team found that when old mice were joined together with young mice, more blood vessels grew in the brain of the old mice, leading to the creation of more neurons that gave the old mice a better sense of smell. During an earlier study, Wagers and her colleagues had discovered that GDF11, a protein, was plentiful in young mice and scarce in old mice, and could rejuvenate heart tissue when injected into older mice.

This time around, Wagers and her colleagues injected GDF11 into the old mice (not joined to younger mice) and found that it also spurred the growth of blood vessels and neurons in the brain, as well as — in a separate new study — stem cells in the aging muscles, increasing the strength and endurance of older mice.

Taken together, the separate research could eventually lead to treatments for human heart disease and degenerative brain disorders like Alzheimer's, among other Fountain of Youth remedies. "There's no conflict between the groups, which is heartening," Dr. Richard M. Ransohoff, director of the Neuroinflammation Research Center at the Cleveland Clinic, told The New York Times.

The idea of being able to rejuvenate body parts this way is exciting, but scientists also warn that stem cells could multiply uncontrollably, leading to cancer. Villeda's team published its findings in the journal Nature Medicine, while Wagers' studies came out in Science. Catherine Garcia

May 28, 2016

With 7 in 10 Americans reporting they are "frustrated" with the 2016 presidential election, this year could be the Libertarian Party's big chance — and America's largest third party is holding its national convention in Orlando, Florida, this weekend.

On the agenda: picking a presidential nominee from among three contenders. Though the contest is considered close, greatest name recognition belongs to former New Mexico Gov. Gary Johnson, who was the Libertarian nominee in 2012, when he picked up more than 1 million votes. Johnson recently polled at 10 percent nationally against Hillary Clinton and Donald Trump, and he would need 15 percent support to make it into the general election debates.

You can watch livestream of the convention proceedings below. The nomination is expected to take place around 5 p.m. Eastern on Sunday. Bonnie Kristian

May 28, 2016

Martin Short and Maya Rudolph stopped by The Tonight Show on Friday, so naturally host Jimmy Fallon had to find something totally outlandish for them to do together. The gang spoofed '80s cop shows with The Windy City Blue, a gag that gets progressively sillier — and windier — with each new bit. Hold onto your hat and watch below. Julie Kliegman

May 28, 2016
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The World Health Organization dismissed a call Saturday to move or cancel the Rio Summer Olympics due to the spread of the Zika virus. The U.N. agency was responding to a Friday open letter from 150 health experts urging them to delay or relocate the event "in the name of public health," citing the mosquito-borne virus' link to birth defects.

"Based on the current assessment of the Zika virus circulating in almost 60 countries globally and 39 in the Americas, there is no public health justification for postponing or cancelling the games," the group's statement read.

The Zika virus is thought to have originated in Brazil. Julie Kliegman

May 28, 2016
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Speaking at Harvard University, Federal Reserve Chairwoman Janet Yellen said Friday that she expects to hike interest rates "probably in the coming months" if the economy continues to improve.

Yellen noted that "growth looks to be picking up from the various data that we monitor," referencing rising oil prices and a weaker, stabilizing dollar as the rationale for her decision, which corresponds with recent remarks from other Fed policymakers.

She argued that a gradual increase from the near-zero rate the central bank has maintained since the 2008 financial crisis "would be appropriate" to push inflation toward the Fed's 2 percent goal. Bonnie Kristian

May 28, 2016
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Things are looking good for Cleveland Cavaliers star LeBron James, and not only because he's expected to star in the long-awaited Space Jam sequel.

James scored 33 points Friday in the Cavs' 113-87 rout of the Toronto Raptors. With the win, his team earned a spot in the NBA Finals against either the Oklahoma City Thunder or the Golden State Warriors, which would be a rematch of last year's contest.

This means, as The New York Times reports, that James is set to appear in his sixth-straight NBA Finals, and seventh overall. He's a two-time champ, both from when he took his talents to the Miami Heat. Julie Kliegman

May 28, 2016

Police arrested at least 35 people Friday at a San Diego rally for Donald Trump. About 1,000 people turned out to protest the hard-line immigration policies of the presumptive Republican presidential nominee, Reuters reports.

Clashes between protesters and supporters were largely non-violent, but police in riot gear began pushing and pepper spraying protesters.

Trump's campaign has come under fire for its history of conflict at rallies and its subsequent handling of both protesters and reporters. On Wednesday, police arrested protesters at Trump's Anaheim rally after they reportedly pelted officers with objects. Julie Kliegman

May 27, 2016

A Home Depot employee in Staten Island, New York, sparked death threats by wearing an "America Was Never Great" hat to work, The New York Times reports. Krystal Lake, 22, says she wore the hat after several co-workers wore pro–Donald Trump pins. "The point of the hat was to say that America needs change and improvement," Lake said. A company spokesman said Lake has been told never to wear the hat again. The Week Staff

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