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RFK Jr. promised to define ‘ultraprocessed’ food. What's taking so long?

A definition would help Americans eat healthier food, experts say. It's turned out to be harder than expected

Japan’s MMX mission will reveal the origins of weird Martian moons

Although Phobos and Deimos may look like lumpy space potatoes, they're actually moons of Mars. No one knows how they formed, but a newly launched spacecraft should soon offer answers

How the brain handles uncertainty, and why resilience matters

The science of handling uncertainty, anxiety and stress

How exposing yourself to your fears can tame your anxiety

It is possible to take lessons from exposure therapy and apply them outside the clinic, experts say

Melanoma Vaccine Ushers in New Hope for Cancer Patients

NINA AGRAWAL

Beyond melanoma, scientists are studying cancer vaccines for glioblastoma, pancreatic cancer and more.

Chimps Steal Less Often From Their Friends, Even When Offered Pineapple

TAYLOR MITCHELL BROWN

The discovery may hint at the roots of human norms around fairness and friendship.

Trump Ties Disaster Aid to Votes as Midterm Fight Heats Up

SCOTT DANCE

President Trump and Vice President JD Vance have dangled FEMA money to disaster-struck states during recent campaign rallies.

Strange triangular craft reported in new U.S. government UFO release

The latest batch of declassified files includes eyewitness sightings from earlier this year of a flying black triangle performing inexplicable aerial maneuvers

The Trump administration is considering a ‘heat ray’ weapon for the border—here’s what to know

The Active Denial System uses millimeter waves to heat people's skin from as far as a kilometer away

Warhound wants to engineer and clone military superdogs—can they do it?

The start-up is the brainchild of a founder of Anduril, the military tech firm, and Colossal Biosciences, a biotech company known for its de-extinction efforts

Are Fewer Teens Identifying as Gay or Bisexual? It’s Complicated.

AZEEN GHORAYSHI

New data have prompted questions about changes in teens’ sexual orientations. But researchers disagree on how much the numbers can really tell us.

NASA lays out a packed 14-day schedule for 2027’s Artemis III moon mission

The mission, scheduled for the summer of 2027, will include be pivotal in deciding whether SpaceX or Blue Origin supplies the lunar lander for the first crewed trip to the lunar surface in decades

Meet the original 'Ghost Busters'—the 17th century scientists who investigated hauntings

They weren't afraid of no ghost

What Amy Poehler’s New Series, ‘Dig,’ Gets Right About Archaeology

STELLA RAINE CHU

To get the science right, classical archaeologists, who excavate the world of the ancient Mediterranean, consulted on the show, which also stars Hugh Laurie.

Some Buy Telescopes. These People Build Them From Scratch.

KATRINA MILLER AND BILLY HICKEY

For a century, amateur telescope makers have gathered at the Stellafane convention to celebrate their craft. Will the event last another 100 years?