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Some people's biology may set them up to birth babies of a certain sex, explaining why a family with multiple children may have all girls or all boys.

In Rehab, journalist Shoshana Walter investigates the systemic pitfalls of drug treatment programs, which prevent people's recovery from addiction.

Solve the math puzzle from our August 2025 issue, which takes you back to the time before cell phones.

An oceanographer explains how climate change, warming oceans and a souped-up atmosphere are creating conditions for deadly floods.

When navigating home, Magellanic penguins alternate between heading straight back in calm waters and swimming with the flow in strong ocean currents.

Anxious dogs might react nervously to some television sounds, a survey of dog owners reports, while hyper ones might try to play chase.

Earth has survived huge temperature swings over eons of climate change. Humans might not be so lucky.

The cells helps the snakes absorb the bones of their prey -- and might show up in other animals that chomp their meals whole.

Serrations at the edges of a fossilized flipper of the ancient marine reptile Temnodontosaurussuggests it may have been able to swim silently.

A young sunlike star called HOPS 315 seems to host a swirling disk of gas giving rise to minerals that kick-start the planet formation process.