A bounty of black holes surround the Sagittarius A supermassive black hole which lies at the center of our Milky Way Galaxy. NASA/CXC/Columbia Univ./C. Hailey et al. hide caption
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Scientists have discovered that a drug used to treat HIV helps restore a particular kind of memory loss in mice. The results hold promise for humans, too. ROBERT F. BUKATY/AP hide caption
Black or brown hydrogen is extracted from coal. Gray hydrogen is made by heating natural gas. Both create carbon dioxide. Blue hydrogen captures about 90% of that carbon dioxide and stores it, usually underground. Green hydrogen uses renewable energy to split hydrogen out of water using electricity. Pink hydrogen does the same but relies on nuclear power. Meredith Miotke for NPR hide caption
Kenyan mountaineer James Kagambi (C), 62, is welcomed upon his arrival as the first Kenyan who reached the summit of Mount Everest, the world's highest peak of 8,849 meters, at Jomo Kenyatta International Airport in Nairobi, Kenya, on May 23, 2022. Yasuyoshi Chiba/AFP via Getty Images hide caption
Demonstrators attend a candlelight vigil Wednesday in Fairfax, Va., for the victims of the Uvalde and Buffalo mass shootings. Allison Bailey/Reuters Connect hide caption
Research shows policies that may help prevent mass shootings — and some that don't
Green the Chow Chow sits in the grooming area at the 142nd Westminster Kennel Club Dog Show at The Piers on February 12, 2018 in New York City. The show is scheduled to see 2,882 dogs from all 50 states take part in this year's competition. Drew Angerer/Getty Images hide caption
ATLANTA, GA - MAY 21: People hold signs during a protest against recently passed abortion ban bills at the Georgia State Capitol building, on May 21, 2019 in Atlanta, Georgia. The Georgia "heartbeat" bill would ban abortion when a fetal heartbeat is detected. (Photo by Elijah Nouvelage/Getty Images) Elijah Nouvelage/Getty Images hide caption
Spallanzani infectious disease hospital Director Francesco Vaia talks to reporters at the end of a news conference Friday in Rome. Andrew Medichini/AP hide caption
The shapes in this salt crystal are consistent with what would be expected for microorganisms. Kathy Benison hide caption
This 830-million-year-old crystal might contain life. And we're about to open it
Abortion rights demonstrators gather near the Washington Monument during a nationwide rally in support of abortion rights in Washington, D.C., US, on May 14, 2022. Yasin Ozturk/Anadolu Agency via Getty Images hide caption
The International Space Station depends on a mix of U.S. and Russian parts. "I hope we can hold it together as long as we can," says former NASA astronaut Scott Kelly. NASA hide caption
Russia's war in Ukraine is threatening an outpost of cooperation in space
Jada Yuan with her grandmother, Chien-Shiung Wu. Wu/Yuan family hide caption
An aerial photo taken in April 2020 shows the scenery of a giant karst sinkhole in China's Guangxi Zhuang Autonomous Region. A similar sinkhole was found earlier this month with an ancient forest at the bottom with trees towering over 100 feet tall. Xinhua News Agency/Getty Images hide caption
Rahima Banu, pictured with her mother in Bangladesh in 1975, is recorded as having the last known naturally-occurring case of the deadly form of smallpox. Daniel Tarantola/WHO hide caption
How Rahima came to hold a special place in smallpox history — and help ensure its end
Particle and experimental physicist Chien-Shiung Wu. University Archives, Rare Book & Manuscript Library, Columbia University Libraries hide caption
Girl grimaces in front of a spoon of bitter medicine. timsa/Getty Images hide caption
Tony D'Amato, director of the University of Vermont's forestry program, visits an experiment site in the Silvio O. Conte National Fish and Wildlife Refuge. Emma Jacobs for NPR hide caption
Foresters hope 'assisted migration' will preserve landscapes as the climate changes
Tampon and Calendar Carol Yepes/Getty Images hide caption
Flags at the base of the Washington Monument fly at half staff to mark one 1 million deaths attributed to COVID-19. Win McNamee/Getty Images hide caption
A COVID Memorial Project installation in September, 2020 marked 200,000 lives lost in the COVID-19 pandemic. The official death toll in the U.S. is on the cusp of a million. Win McNamee/Getty Images hide caption