World This week in science: Pompeiian frescoes, dark energy and the largest marine reptile NPR's Mary Louise Kelly talks with Emily Kwong and Rachel Carlson of Short Wave about newly unearthed Pompeiian frescoes, how dark energy may be changing, and the largest known marine reptile. Rachel Carlson Emily Kwong
Wildfire smoke contributes to thousands of deaths each year in the U.S. Two new studies show the unseen toll smoke is taking on people across the country. Climate change is likely to make the problem even bigger. Alejandra Borunda
National Finally! Tough new safety rules on silica dust are out to protect miners' lungs Addressing a problem first identified 50 years ago, federal regulators say stricter new rules to limit miners' exposure to silica dust are expected to finally go on the books on Tuesday. Howard Berkes Justin Hicks
National Researchers have been trying to breed fungus-resistant chestnut trees for 100 years We visit an orchard where researchers are breeding Chestnut trees they hope will one day fight off a fungus that's been killing the iconic American tree for more than a century. Roxy Todd
Never seen an exploding star? This year, you'll have your chance A nova of the T Coronae Borealis star system is expected to happen at some point through September, and will make it as bright as the North Star for several days. Joe Hernandez
Gay people often have older brothers. Why? And does it matter? Studies worldwide show that queer people tend to have more older brothers than other kinds of siblings. Justin Torres, a queer novelist and the youngest of three brothers, asks: Should it matter? Selena Simmons-Duffin
2 cicada broods will emerge around the same time in the U.S. NPR's Scott Detrow speaks with entomologist Michael Raupp about the two cicada broods that will emerge in parts of the U.S. in a few weeks.
National How to give kids autonomy? 'Anxious Generation' author says a license to roam helps Kids have too much screen time and not enough autonomy, says author Jonathan Haidt. His book The Anxious Generation argues this has caused an epidemic of mental illness and suggests ways to fix it. Michaeleen Doucleff
Sisters make peace with dark memories through art, science and each other Two sisters found they had different recollections of a traumatic childhood experience and learned that human memory is a lot less reliable than we tend to think. Gabriel Spitzer
National What biologists see from the shores of the drying Great Salt Lake Half of the Great Salt Lake in Utah has now dried up but scientists say there's still some time left to reverse its decline. Kirk Siegler