Low-dose estrogen can be taken orally, but it's also now available in patches, gels and creams. svetikd/Getty Images hide caption
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The medical community dates pregnancy to the first day of a woman's last period, even though fertilization generally happens two weeks after that. It's a long-standing practice but a confusing one. Nikola Stojadinovic/Getty Images hide caption
A Nazca booby in the Galápagos Islands incubates eggs with its webbed feet. Wolfgang Kaehler/LightRocket via Getty Images hide caption
For birds, siblinghood can be a matter of life or death
This illustration shows the Milky Way, our home galaxy. NASA/JPL-Caltech hide caption
The mysterious 'Great Attractor' pulling the Milky Way galaxy off course
The new guidelines were prompted by increased rates of breast cancer in women in their 40s. They recommend mammograms every other year, starting at age 40. izusek/Getty Images hide caption
This image shows a brain "assembloid" consisting of two connected brain "organoids." Scientists studying these structures have restored impaired brain cells in Timothy syndrome patients. Pasca lab, Stanford University hide caption
Scientists restore brain cells impaired by a rare genetic disorder
Climbing stairs is a good way to get quick bursts of aerobic exercise, says cardiologist Dr. Carlin Long. lingqi xie/Getty Images hide caption
Elevator or stairs? Your choice could boost longevity, study finds
A new version of the popular board game Catan, which hits shelves this summer, introduces energy production and pollution into the gameplay. Catan GmbH hide caption
How the new Catan board game can spark conversations on climate change
Menthol cigarettes are popular among Black and Latino smokers, and a Biden administration official cited civil rights as a reason the ban is being dropped. Mario Tama/Getty Images hide caption
Katie Krimitsos is among the majority of American women who have trouble getting healthy sleep, according to a new Gallup survey. Krimitsos launched a podcast called Sleep Meditation for Women to offer some help. Natalie Champa Jennings/Natalie Jennings, courtesy of Katie Krimitsos hide caption
Bird flu is spreading through U.S. dairy cattle. Scientists say the risk to people is minimal, but open questions remain, including how widespread the outbreak is and how the virus is spreading. DOUGLAS MAGNO/AFP via Getty Images hide caption
The Flint River water starts flowing to Flint, Mich. on April 25, 2014. Without corrosion control, lead leeched from the pipes. Brett Carlsen/Getty Images hide caption
10 years after Flint, the fight to replace lead pipes across the U.S. continues
A coyote at the Fort Worth Zoo is photographed in the hours leading up to the April 8 total solar eclipse. The Hartstone-Rose Research Lab, NC State hide caption
Animals get stressed during eclipses. But not for the reason you think
Dr. Jeffrey Stern, assistant professor in the Department of Surgery at NYU Grossman School of Medicine, and Dr. Robert Montgomery, director of the NYU Langone Transplant Institute, prepare the gene-edited pig kidney with thymus for transplantation. Joe Carrotta for NYU Langone Health hide caption
A woman with failing kidneys receives genetically modified pig organs
Wildfire smoke from Canada caused dangerously unhealthy air quality in New York City and across much of the U.S. in 2023. While air quality has improved greatly in the U.S. in recent decades, wildfire smoke and other climate-influenced problems are endangering that progress. Ed Jones/AFP via Getty Images hide caption
The U.S. Food and Drug Administration said Tuesday, April 23, 2024, that samples of pasteurized milk had tested positive for remnants of the bird flu virus that has infected dairy cows. Rich Pedroncelli/AP hide caption
Damming waterways is what beavers do best, often to the chagrin of people who want the opposite. But those same damming skills are what make beavers important ecosystem engineers. Chase Dekker Wild-Life Images hide caption
Members of the Voyager team celebrate at NASA's Jet Propulsion Laboratory after receiving data about the health and status of Voyager 1 for the first time in months. NASA/JPL-Caltech hide caption