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Mars may be two-faced to its core

The Red Planet's global geography of low-lying northern plains and rugged southern highlands seems to have surprisingly deep roots, with profound implications for Mars's ancient habitability

Jill Lepore on why Silicon Valley gets science fiction wrong

Historian Jill Lepore explains what tech leaders miss in their favorite stories—and why the fight over AI data centers may be where the machine stops

The Ruthless Efficiency of Ultrapotent Street Drugs

MATT RICHTEL

Five decades after the “war on drugs” sought to make substance abuse unaffordable, illicit drugs are cheaper and more powerful than ever. A visit to Baltimore shows why.

Wall of floodwater sweeps away villages in Nepal, with hundreds missing

A massive flood potentially caused by a chunk of ice breaking off from a glacier has swept away bridges, schools, and other buildings and killed at least 160 people

More Americans believe the government is withholding information about UFOs

According to new research, more Americans also think they have seen a UFO now than in the past 50 years

Is there a ‘window of opportunity’ to prevent Alzheimer’s in women?

A pair of new studies point to the role of early menopause and hormone treatment in cognitive decline, but more research is needed, experts say

Army Awards $2.2 Billion for ‘Microreactors’ On U.S. Bases

BRAD PLUMER

The move is part of the Trump administration’s efforts to spur the country’s largest expansion of nuclear power in more than three decades.

New NASA photos reveal 16 galaxies from across the cosmos in dazzling detail

Spirals, ellipticals, irregulars, oh my!

Is the keto diet better than the Mediterranean? New clinical trial reveals health benefits

In a clinical trial, people with obesity saw clear health benefits on the keto diet that they didn't see on two other popular eating regimens

NASA’s Roman Space Telescope will rewrite how we study the universe

Astronomers are lining up to leverage NASA's soon-to-launch Nancy Grace Roman Space Telescope, which boasts capabilities unlike any previous off-world observatory

Why glacial collapse likely caused the Nepal disaster—and why climate change will make these events more likely

The disaster has claimed hundreds of lives, and at least 1,400 people are missing

Near-Total Lunar Eclipse Will Turn Moon Blood Red

KATRINA MILLER

People in the Americas, Africa and Europe will have a chance to see Earth’s shadow create a near-total blood moon.

New Drug Approved by F.D.A. for Pancreatic Cancer Could Be First of Many

REBECCA ROBBINS AND CAROLYN Y. JOHNSON

Companies are testing dozens of similar drugs in cancers of the pancreas, lung, colon and more.

What Nepal's floods reveal about “cascading hazards”

The Nepal disaster appears to be a "cascading event," where one hazard seems to have triggered another, experts say

Climate change is supercharging El Niños, coral records show

Fossilized Galápagos corals show clear evidence that today's El Niños are much stronger than those in the past