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President Trump has argued the U.S. should test nuclear weapons because other countries are doing it. But scientific data suggest they're not.

A microscope reveals an algae-like adaptation that might future-proof crop photosynthesis in extreme heat.

Ammolite gems' fabulous colors arise from delicate assemblies of crystal plates.

The birds grunt like tennis pros when generating their rat-a-tat, a performance strategy that may help stabilize core muscles.

Streams of liquid form drops thanks to unidentified disturbances. It could be the jiggling of individual molecules.

Planetary scientist Adeene Denton runs computer simulations to investigate Pluto, the moons of Saturn and other icy bodies in the solar system.

Math and physics explain the anguish of a golf ball that zings around the rim of the hole instead of falling in.

Supernova remnants, stellar nurseries and more populate the new edge-on view of the Milky Way as seen from Earth's southern hemisphere.

From blaming the victim to replying "I have no interest in your life" to suicidal thoughts, AI chatbots can respond unethically when used for therapy.