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Protons and neutrons in an atom’s nucleus can be arranged in different configurations, creating nuclear isomers. KTSdesign/SciencePhotoLibrary via Getty Images

Nuclear isomers were discovered 100 years ago, and physicists are still unraveling their mysteries

Nuclear isomers are rare versions of elements with properties that mystified physicists when first discovered. Isomers are now used in medicine and astronomy, and researchers are set to discover thousands more of them.
Interior view of Polito’s Royal Menagerie, Exeter Change, Strand, Westminster, London, 1812. Heritage Images/Hulton Archives via Getty Images

Where was the world’s first zoo?

Historians aren’t sure exactly when the first zoo was built, but it’s clear humans have kept exotic animals for thousands of years.
An artist’s concept of an astronaut walking on Mars. But what would happen if the astronaut weren’t wearing a space helmet? cokada/E+ via Getty Images

Could people breathe the air on Mars?

Mars is the fourth planet from the Sun and one of our closest neighbors in space. But it’s not a very welcoming place for an Earthling to visit.
After great popularity, the idea of power poses came under fire. Choreograph/iStock via Getty Images Plus

The idea that power poses boost your confidence fell from favor – but a new review of the research calls for a second look

For a while it was all the rage to adopt Wonder Woman’s famous stance and other body positions that allegedly pumped up your confidence – until more studies of the phenomenon failed to find the connection.
Researchers can test blood samples taken for other reasons to see if patients have previously had COVID-19. Don Bartletti/Los Angeles Times via Getty Images

COVID-19 official counts can miss mild cases – here’s how serosurveys that analyze blood for signs of past infection can help

Your blood can hold a record of past illnesses. That information can reveal how many people have had a certain infection – like 58% of Americans having had COVID-19 by the end of February 2022.
Co-author Chloe Gustafson and mountaineer Meghan Seifert install measuring equipment on an ice stream. Kerry Key/Lamont-Doherty Earth Observatory

Scientists in Antarctica discover a vast, salty groundwater system under the ice sheet – with implications for sea level rise

Liquid water below the ice determines how fast an ice stream flows. As the ice sheet gets thinner, more of that salty groundwater could rise.
Many places have banned sunscreens with certain chemicals in an attempt to help protect coral reefs. Westend61 via Getty Images

Corals and sea anemones turn sunscreen into toxins – understanding how could help save coral reefs

Researchers have long suspected that an ingredient in sunscreen called oxybenzone was harming corals, but no one knew how. A new study shows how corals turn oxybenzone into a sunlight-activated toxin.