Christopher Intagliata

A study of trees in dozens of cities found that urban heat and light pollution are pushing urban trees to sprout leaves about a week earlier than trees in more rural settings.

The annual winter monarch butterfly migration, which has seen steep declines in recent years, seems to be making a comeback. Biologists are encouraged and confused by the trend.

In recent years, monarch butterflies have all but disappeared from their annual Pacific Coast migration. But there are promising signs the population could stage a comeback.

NPR's Mary Louise Kelly talks with Charles Coleman Jr., a civil rights lawyer and former prosecutor, about Kyle Rittenhouse, who shot and killed two people, being found not-guilty of all charges.

Researchers have determined that one of the fastest motions the human body can generate is a simple snap of the fingers.

NPR's Mary Louise Kelly speaks with Mark Richards, Kyle Rittenhouse's trial attorney. Rittenhouse was facing life in prison for shooting and killing two men. He was found not-guilty on all charges.

NPR's Mary Louise Kelly talks with Dr. Celine Gounder, an infectious disease specialist and epidemiologist at New York University, on mixing and matching COVID booster shots with an original vaccine.

NPR's Mary Louise Kelly talks with U.S. Special Envoy for Belarus Julie Fisher about the migrant crisis along the Belarus-Poland border.

NPR's Mary Louise Kelly speaks with Carmen Solana, a volcanologist at the University of Portsmouth, about the impact of the ongoing volcano eruption at La Palma, in the Canary Islands.

Researchers in the field of fluid dynamics say understanding the sounds oil bubbles make at different temperatures has applications beyond the frying pan.

NPR's Audie Cornish talks with Richard Trenchard, the Food and Agriculture Organization of the United Nations' representative in Afghanistan, about a worsening hunger crisis there.

A new study examined 77 bird species in the Amazon over a 40-year period. It found they were rapidly evolving due to rising temperatures because smaller birds shed heat more efficiently.

Chefs in Japan dip a wet chopstick in hot oil and listen to the sizzle, to know when it's ready for tempura. A physicist investigated that technique in the lab to zero in on the perfect fry frequency.

Over the last four decades, birds in the Amazon have been shrinking — and scientists believe their smaller bodies may be a response to hotter, drier weather brought by climate change.

NPR's Mary Louise Kelly speaks with Stéphane Dujarric, spokesman for the UN Secretary-General António Guterres, on the detention of UN aid workers in Ethiopia and the political state of affairs there.

The music we listen to varies according to the time of day, with qualities like tempo and danceability heightening later in the day, according to a data analysis of online music streaming habits.

NPR's Audie Cornish talks with science writer Brendan Borrell about a patent feud between Moderna and the federal government over its COVID vaccine — and why it could have implications for the world.

With eight dead, concertgoers have been filing lawsuits against Astroworld's planners. NPR's Audie Cornish talks with University of Suffolk professor Keith Still about how tragedies like this happen.

NPR's Mary Louise Kelly talks with reporter Lautaro Grinspan about misinformation being spread on Spanish talk radio in Southern Florida and the effect on the Cuban immigrant population there.

The country's top infectious disease doctor says he is looking for "a level of control" over COVID-19 such that it is less disruptive to society — and he again stressed the importance of vaccination.