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Preliminary study finds that testosterone levels increase or stabilize in people taking GLP-1 medications

Fathers show changes in some of the same brain areas as mothers, but the effect of parenthood on dads isn’t nearly as well studied

From tiny hamsters to giant salamanders, here are some of the most unusual examples of fatherhood across the animal kingdom

Influencers and ultra-rich people looking to extend their lifespan are trading tips and tricks on how to eke out extra years

People with “fearful” or “preoccupied” insecure attachment styles had more children, whereas securely attached people had fewer, according to a recent study

The Trump administration wanted the surface of the Lincoln Memorial Reflecting Pool to be “American flag blue.” A water-treatment expert explains why the pool is still algal green and why the bloom could keep coming back

From booed hydration breaks to cooling-gel vests, teams are trying everything to keep their players from overheating. Physiologists—and one World Cup team doctor—say feeling cooler is different than cooling the body

A new study captures how cork, wine and air interact over time

Astronomers may have found the remains of two long-dead stellar siblings

This operation opens the door to treating more people living with HIV who have end-stage organ disease

A new method that detects whether bones have been burned reveals Homo erectus brought fires into caves far earlier than previous evidence had suggested

The James Webb Space Telescope has found nearby brown dwarfs masquerading as far-distant galaxies. The discovery reinforces how, in astronomy, what you see isn’t always what you get

The quest to approximate irrational numbers with fractions reveals hidden patterns, surprising hierarchies and enduring mathematical mysteries

Everyday viral infections may be quietly reshaping the body’s network of molecules that support cells and tissues in ways that can raise cancer risk over time

These ruins, located just five kilometers from Stonehenge, likely laid the groundwork for religious rites celebrating the longest and shortest days of the year

This “extraordinary” event was likely caused by seismic waves bouncing off Earth’s core, researchers found

Next summer, NASA’s Lucy spacecraft will start sidling up to several asteroids near Jupiter. On its way there, it has studied another space rock up close

The effort to pull some 900 ocean-monitoring buoys and sensors from the water drew backlash from scientists and lawmakers

This partnership marks the latest foray into space exploration for Relativity Space, which aims to build cheap, reusable rockets

Even if you aren’t going to be within the path of totality, you can still watch the solar eclipse as it happens with Scientific American