A stencil of a handprint in an Indonesian cave is the oldest known rock art Scientists have discovered what they say is the earliest known rock art, in a cave in Indonesia. They say the image dates to more than 67,000 years ago. Christopher Intagliata
Blue Origin pauses space tourism flights to focus on lunar lander Blue Origin, owned by billionaire Jeff Bezos, says it's stopping human spaceflights for at least two years. The move will allow it to "shift resources" to the company's lunar landing capabilities. Brendan Byrne
He suffered two strokes. This electric brain implant helped him regain use of his arm Perhaps the most compelling finding from a UW Medicine study to help stroke victims recover hand movement is that if its first subject applied to be part of the study today, he would not qualify. Stephen Howie
Humpback whales cast bubble nets to catch prey. They may be learning from each other Humpback whales will sometimes use an intricate strategy to catch food called bubble-net feeding. A new study suggests they're spreading the knowledge of how to do it to each other. Nathan Rott
Scientists shed new light on the brain's role in heart attack Researchers discovered a feedback loop between nerve cells, the immune system and the heart. They think it shows promise as a target for future therapies. Esther Landhuis
40 years after Challenger: Lingering guilt and lessons learned Forty years after the Challenger disaster, NPR explores the engineers' last-minute efforts to stop the launch, their decades of guilt and the vital lessons that remain critical for NASA today. Howard Berkes
What is 'frost crack' and how does it affects trees? Sudden or severe cold temperature can cause trees to experience "frost crack." NPR's Scott Simon talks with Bill McNee of the Wisconsin Department of Natural Resources about what happens and why. Scott Simon
In President's Trump's tangled science policies, experts see a unifying thread Heading into the second year of Trump 2.0, when it comes to science, some argue Trump has no consistent ideology for decision-making. Others argue the unifying theme is destruction of science itself. Katia Riddle
Gladys West, mathematician whose work paved the way for GPS, dies at 95 A self-described "little farm girl" in the Jim Crow Era, Gladys West's complex and pioneering work for the U.S. Navy helped to improve billions of lives — and keep us from getting lost. Bill Chappell
The week in science: Ice, parents' disgust and penguins adapting to climate change Emily Kwong and Regina Barber of NPR's Short Wave podcast talk about the mysterious structure of ice, parents' heightened tolerance for disgust, and how penguins are adapting to climate change. Regina G. Barber