Bear 402 was "the mother of at least eight litters, more than any other bear currently at Brooks River," according to the National Park Service. The bear, seen here fishing with her yearlings in 2019, was killed in a fight with another bear on Monday. N. Boak/NPS Photo hide caption
Samples of yeast collected around Baltimore, that are being stress-tested at the Casadevall lab at Johns Hopkins University. Casadevall Lab hide caption
Hurricane Helene dropped more than 2 feet of rain on Spruce Pine, N.C. The town is home to one of the world's only sources of high-purity quartz, which is used to manufacture silicon chips and solar panels. Spencer Bost hide caption
Perspective view on the upper portions of the Timpanogos rock glacier in north-central Utah. Matthew Morriss hide caption
Student researchers Mayisha Alam (L) and Swazi Tshabalala (R) collect samples as part of their work with the nonprofit BioBus. Christine Marizzi/BioBus hide caption
Butch Wilmore, far left, and Suni Williams, far right, welcome Nick Hague, front left in blue, and Alexander Gorbunov, front right in blue, on Sunday. Behind them, from left in black, are NASA's Jeanette Epps, Russia's Alexander Grebenkin, NASA's Mike Barratt and NASA's Matthew Dominick. From left, in red, are Russia's Ivan Vagner, NASA's Don Pettit and Russia's Alexei Ovchinin. NASA/AP hide caption
Astronauts and Artemis II mission specialists Christina Koch, left, and Jeremy Hansen, right, exit the International Space Station mockup in the Space Vehicle Mockup Facility on Aug. 26, 2024, at the NASA Johnson Space Center in Houston, Texas. Danielle Villasana for NPR hide caption
People displaced by floods rest at a relief shelter in Mohipal, Feni, a coastal district in southeast Bangladesh on August 23. Fatima Tuj Johora/AP hide caption
Hurricane Helene became a major hurricane before landfall, reaching a Category 4 Thursday. Forecasters have been warning communities hundreds of miles inland to prepare for its powerful winds and flooding rains. CIRA/NOAA hide caption
California is banning single-use plastic bags at grocery stores and other retailers, after an earlier ban was blamed for making the waste problem worse. Here, a worker pulls a plastic bag from a conveyor belt as she sorts through materials at a recycling center in San Francisco. Justin Sullivan/Getty Images hide caption
Turtles being released into the New Jersey woods. Nathanael Stanek/The Turtle Conservancy hide caption
Matter and its weird, opposite antimatter annihilate each other "in a blaze of glory," says Jessica Esquivel, an experimental particle physicist at Fermilab. PeteDraper/Getty Images hide caption
California’s new lawsuit says that ExxonMobil has known for decades that recycling would not effectively stem the flow of plastic waste. Despite that knowledge, the lawsuit says, the company actively promoted recycling as a viable solution to plastic pollution. Mark Humphrey/AP hide caption
Octopuses and fish hunt in groups, and octopuses have been observed striking fish who try to freeload. //Eduardo Sampaio hide caption
Jason Mazzola walks to work at The Residence at Natick South, an LCB Senior Living community in Natick, MA. August 22, 2024.
Jodi Hilton for NPR
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Electrolyzers fill a pair of warehouses in the desert near Delta, Utah. The machines make hydrogen by splitting water molecules. Michael Copley/NPR hide caption
Earth's moon will have some company for a couple months this fall. Jim Watson/AFP/Getty Images hide caption
Aboard the International Space Station, astronauts cut their hair using a pair of electrical sheers connected to a vacuum. NASA astronaut Frank Rubio says, "It's not a pretty haircut, for sure." Getty Images hide caption
Pesto the king penguin chick, right, mingles in his enclosure at Sea Life Melbourne Aquarium on Friday. Rod McGuirk/AP hide caption
Rats and people have long coexisted. Now research may find out a lot more about them Gary Hershorn/Getty Images hide caption
This semi-aquatic lizard produces a bubble over its nostrils to continue breathing underwater. Lindsey Swierk hide caption