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What is E15 fuel? Why higher-ethanol gasoline could raise summer smog levels

In an effort to reduce prices at the pump, an EPA wavier allows the sale of fuel with 15 percent ethanol content

Bixonimania’—the fake illness that AI fell for

How an experiment involving a made-up skin condition exposes the risks of increasingly popular AI medical advice

A New Era of Exploring the Universe in Radio

KATRINA MILLER

With 263 antennas spread across the U.S. and Mexico, the Next Generation Very Large Array, would join a new wave of radio astronomy.

What will happen if the Milky Way and Andromeda galaxies collide?

Our galaxy and its nearest large companion, Andromeda, may be headed for a collision on a cosmic scale. What happens then?

Span wants to turn homes into mini data centers

Smart-panel start-up Span wants to turn spare household electricity into AI computing power. How far it can scale and what effect that would have on the residential grid remain unsettled

Earth’s molten outer core is behaving in chaotic, unexpected ways

Scientists are working to solve a mystery of Earth's molten outer core, which lies more than 2,000 kilometers beneath our feet

Rare Ebola-causing Bundibugyo virus is uniquely challenging to treat. Here’s why

Bundibugyo virus is an uncommon species of Ebola-causing virus that has been linked to only two other known outbreaks

Why lawyers keep citing fake cases invented by AI

The trend of attorneys getting caught citing AI-hallucinated cases points to a broader problem: instead of checking AI's work, people keep trusting it

Far side moon photos reveal hidden lunar minerals in brilliant color

An astrophotographer teamed up with Artemis II commander Reid Wiseman to create these stunning new images of the lunar surface

SpaceX to Attempt Launch of Updated Starship Rocket

KENNETH CHANG

If a problem with the launch tower is fixed, SpaceX will try to launch on Friday evening.

SpaceX launches Starship V3—the world's most powerful and tallest rocket ever

Friday's test flight marks a major milestone for SpaceX as the company gears up to go public and to participate in NASA's Artemis III mission in 2027

Experimental Drug Yields Dramatic Weight Loss

GINA KOLATA AND REBECCA ROBBINS

People who got the injection, retatrutide, lost 28 percent of their body weight on average after 80 weeks, Eli Lilly said.

A Powerful El Niño Is Forming. If History Is a Guide, It Could Hit Hard.

CHICO HARLAN

The biggest episodes of the past have altered the course of human events, according to researchers. An emerging one is drawing historic comparisons.

Trump Eases Restrictions on Climate ‘Super Pollutants’

LISA FRIEDMAN AND MAXINE JOSELOW

The administration is delaying a phaseout of hydrofluorocarbons, potent planet-warming chemicals used in air-conditioning and refrigeration.

The universe could have 18 possible shapes

Our universe appears flat—but this observation still leaves plenty of options for its true shape. In fact, our cosmos could resemble a donut