Like to bike? Your knees will thank you and you may live longer, too New research shows lifelong bikers have healthier knees, less pain and a longer lifespan, compared to people who’ve never biked. This adds to the evidence that cycling promotes healthy aging. Read more on NPR

How does Trump’s trial end? It may hinge on how jurors feel about sex and privacy The Trump’s Trials team breaks down why prosecutors have a timeline problem, what Michael Cohen’s testimony so far has shown, and why it may all come down to a question of sex and privacy in the end. Read more…

When sea otters lose their favorite foods, they can use tools to go after new ones Some otters rely on tools to bust open hard-shelled prey items like snails, and a new study suggests this tool use is helping them to survive as their favorite, easier-to-eat foods disappear. Read more on NPR

She was a single mom, alone at hospital with her son. Then a familiar face appeared In 2006, Patricia Nieshoff’s three-year-old son had a seizure. She was a single mother, with no one to accompany her to the hospital. But an hour into her hospital stay, a familiar face appeared. Read more on NPR

Rwanda is transforming and growing — but at what cost? Rwanda’s post-genocide transformation has been remarkable, but uneven. And it prompts many questions, including: what type of leader is needed to help a country grow and heal? Read more on NPR

Iranian President Ebrahim Raisi, a hard-liner who crushed dissent, dies at 63 Iran’s ultraconservative president, killed in a helicopter crash, oversaw a crackdown on women’s protests and was linked to extrajudicial killings in the 1980s. Read more on NPR

Sperm whale families talk a lot. Researchers are trying to decode what they’re saying Scientists are testing the limits of artificial intelligence when it comes to language learning. One recent challenge? Learning … whale! Researchers are using machine learning to analyze and decode whale sounds — and it’s just as complicated as it seems. Curious…