Disappearing sea ice in Antarctica is putting emperor penguins at risk of extinction, researchers warn.

"The population is declining," says Hal Caswell, senior scientist at Woods Hole Oceanographic Institute and an author of a new study in Nature Climate Change. "Unless something changes to stop that, the population will go into extinction."

By 2100, the entire population could decrease by one-third, with all 45 of the known emperor penguin colonies in Antarctica taking a hit. The biggest drops will happen on the coasts of the western Indian Ocean and eastern Weddell Sea, The Guardian says.

The main food source of penguins is krill, and young krill eat the algae on ice; as the ice is lost, the supply of krill drops. The researchers say that one way to help the penguins would be putting them under the protection of the Endangered Species Act. Also, "given this new research, and what we already know about global temperatures warming and the changing climate," says Andrea Kavanagh, director of global penguin conservation for the Pew Charitable Trusts, the U.S. should immediately "put a marine reserve in place so we can make sure we are not fishing in areas where the penguins need to forage for food." Catherine Garcia

Zbigniew Brzezinski, who served as national security adviser to President Jimmy Carter, died Friday in Virginia. He was 89.

The son of a Polish diplomat whose background was in academia, Brzezinski advised Carter throughout his presidency, guiding the White House during the Iranian revolution and hostage crisis as well as the Soviet Union's invasion of Afghanistan. Though a hard-line Cold War hawk — he implicitly encouraged, for example, Chinese support of the totalitarian Pol Pot regime to limit Soviet influence in Vietnam — in his later years, Brzezinski opposed the U.S. invasion of Iraq in 2003.

His death was announced by his daughter, MSNBC host Mika Brzezinski, on social media. "He was known to his friends as Zbig, to his grandchildren as Chief and to his wife as the enduring love of her life," she wrote. "I just knew him as the most inspiring, loving and devoted father any girl could ever have."

Former President Carter in a statement remembered Brzezinski as "a superb public servant" and a "brilliant, dedicated and loyal" man. Bonnie Kristian

The Senate Intelligence Committee has asked President Trump's campaign to hand over all documents, including phone records and emails, with any reference to Russia dating from June of 2015 onward. The request, which The Washington Post reported Friday evening citing two unnamed sources, is part of the committee's investigation into alleged Russian meddling in the 2016 election.

The committee's letter arrived last week, and campaign staffers are reportedly in the process of cooperating, though they have been instructed not to comment publicly. The letter was signed by committee chair Sen. Richard Burr (R-N.C.) as well as Sen. Mark R. Warner (D-Va.), the committee's ranking Democrat.

This is the first time the Senate Intelligence Committee's investigation, which is distinct from the Justice Department probe led by Special Counsel Robert Mueller, has involved the official campaign organization. Bonnie Kristian

President Trump's son-in-law and top adviser Jared Kushner reportedly held discussions with Russia's ambassador about setting up a secret communication channel between the Trump transition team and the Kremlin shortly after the election, intelligence officials confirmed to The Washington Post.

The Post first learned of Kushner's inquiry in an anonymous letter sent in December; Kushner's meeting with Ambassador Sergey Kislyak reportedly happened at Trump Tower on Dec. 1 or 2. Kushner apparently suggested using Russian diplomatic facilities for the secret communications, alarming Kislyak, as that would have been a security risk for Russia, too.

... Kushner conveyed to the Russians that he was aware that it would be politically sensitive to meet publicly, but it was necessary for the Trump team to be able to continue their communication with Russian government officials.

In addition to their discussion about setting up the communications channel, Kushner, [Trump's former National Security Adviser Michael] Flynn, and Kislyak also talked about arranging a meeting between a representative of Trump and a "Russian contact" in a third country whose name was not identified, according to the anonymous letter. [The Washington Post]

Senior U.S. officials expressed shock at Kushner's bold proposition, especially as Russian communications are closely monitored by the U.S., with one calling his idea "extremely naive or absolutely crazy.” Read the full scoop at The Washington Post. Jeva Lange

A Yale University dean has been put on leave over racially insensitive remarks she made in Yelp reviews. "If you are white trash, this is a perfect night out for you," June Chu wrote about a Japanese restaurant. In other posts, she noted "I am Asian" as proof of her culinary expertise, warned of "sketchy" crowds at a movie theater, and called the workers "morons" who serve "snack orders to the obese." The Week Staff

President Trump on Friday condemned the "merciless slaughter of Christians in Egypt" and urged "all who value life" to confront terrorists' "war against civilization." At least 26 people, including children, were killed Friday when eight gunmen dressed in military uniforms attacked a bus and a pickup truck carrying Coptic Christians. The Coptic Christians, a minority group that has long faced discrimination in Egypt, were traveling to St. Samuel Monastery in Egypt's Minya province, located south of Cairo.

"Civilization is at a precipice — and whether we climb or fall will be decided by our ability to join together to protect all faiths, all religions, and all innocent life," Trump said in the statement, pushing for everyone to unite "for the righteous purpose of crushing the evil organizations or terror, and exposing their depraved, twisted, and thuggish ideology." Becca Stanek

We've all been there — tossing and turning in sweat-soaked sheets, fan on full blast, wishing we could just fall asleep. A nearly decade-long study of 765,000 Americans, published Friday, found that as the world warms as a result of climate change, we are likely to get worse and worse night sleeps due to the difficulty of slumbering when it's hot out. "Elderly people, and people making less than $50,000 per year, seem especially affected by the trend," The Atlantic writes.

Basically, for thousands and thousands of years hot days would cool into comfortable nights as the sun's heat radiated back out into space in the evening. But now greenhouse gases reflect that heat back at the Earth, even at night, keeping us toasty if we don't have the a/c on full blast. "We know from a broad literature in the laboratory context that our sleep is regulated pretty heavily by our body temperature — and especially by our core body temperature," said Nick Obradovich, one of the study's authors.

Obradovich added that while the study focused on the U.S., it could be even harder for people in other parts of the world to power through the hot nights. "In Ghana, it's really hot and really humid, and there are no other options. You just suffer through the heat," he said.

Getting adequate sleep, of course, is important for good health. Deprivation has been linked to conditions like high blood pressure, heart disease, and obesity, as well as shorter-term consequences like problems with mood and memory. Obradovich noted that older people tend to have higher mortality rates during heat waves, too, and part of the reason could be all the tossing and turning cutting into their sleep.

Read more about Obradovich's research at The Atlantic. Jeva Lange

It may almost be June 2017, but 2016 presidential election rhetoric lives on. After Hillary Clinton took some jabs at President Trump during her commencement speech Friday at her alma mater, Wellesley College, Republican National Committee Chairwoman Ronna McDaniel released a statement swinging back. "Today's speech was a stark reminder why Hillary Clinton lost in 2016," McDaniel said in the statement. "Instead of lashing out with the same partisan talking points, Hillary Clinton would be wise to look inward, talk about why she lost, and expand the dwindling base of Democratic Party supporters — we won't hold our breath though."

Clinton didn't call Trump out by name in her speech, which she began by discussing former President Richard Nixon and what it was like living through his resignation. "We were furious about the past presidential election of a man whose presidency would eventually end in disgrace with his impeachment for obstruction of justice," Clinton said. She added that this happened "after firing the person running the investigation into him at the Department of Justice," a not-so-veiled allusion to Trump's recent firing of former FBI Director James Comey.

Clinton encouraged the graduates to remain hopeful despite the "full-fledged assault on truth and reason" and to reach out to people "hurt" by the Trump administration's newly introduced budget plan, which she called a "con." Becca Stanek