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Did the last common ancestor of humans and apes walk like a gorilla? A new study offers a clue

Some extinct human ancestors and modern-day apes appear to share wrist traits that raise the question of whether our last common ancestor walked on its knuckles

NASA’s plan for a nuclear reactor on the moon could change space exploration forever—if it works

Nuclear power could enable long-term lunar missions, but NASA's timeline may be too ambitious

The Colorado Avalanche is dominating the NHL—Denver’s high elevation could be the reason

Denver's hockey team is studded with stars, but training and playing the game some 5,000 feet above sea level may give their athletic performance a boost over that of their rivals

Ebola Was Identified in Congo Weeks Before W.H.O. Declared an Emergency

RUTH MACLEAN

Early surveillance and testing failed to identify the rare species of Ebola responsible for the current outbreak. An American doctor is among the confirmed cases.

Europe’s Green-Energy Future Has a Reindeer Problem

ALEXA ROBLES-GIL, SACHI KITAJIMA MULKEY AND MICHAL SIAREK

In northern Norway, Sami people fear a copper mine will disrupt their traditional lifestyles.

Scientists Tweaked the Global Warming Outlook. So Trump Weighed In.

ERIC NIILER

Renewable energy has helped make the worst-case scenario a bit less bad. The president said, falsely, it shows that climate scientists were wrong all along.

NASA's Psyche captures gorgeous Mars crescent photo on way to asteroid

NASA's Psyche snapped the images as it flew by Mars last week, using the planet's gravity to give it a boost as it continues its journey toward its target asteroid

E.P.A. to Repeal Some Limits on ‘Forever Chemicals’ in Drinking Water

LISA FRIEDMAN

The rules were established by the Biden administration after research linked the compounds to a range of serious health problems.

Ebola Crisis Sparks Debate Over Global Health Double Standards

MATTHEW MPOKE BIGG

To some Africans, the claim that the continent’s largest health agency had already bungled its response scratched a familiar wound.

Vaccines for Bundibugyo Ebola virus outbreak are being developed, but none are ready yet

A decade after Ebola vaccines changed outbreak response, a new epidemic in central Africa is caused by a strain the world never fully prepared for

This Moon of Neptune Might Have Survived a Wrecking-Ball Event

JONATHAN O’CALLAGHAN

Neptune’s moons have long provided evidence of a cataclysm four billion years ago. A new study suggests one moon may have made it through.

These bizarre fossils represent some of the earliest moving, sexually-reproducing life ever discovered

New trove of fossils reveals that ancestral animals likely emerged in the deep sea

An Ebola outbreak is spreading fast. Should you be worried?

A deadly Ebola outbreak in parts of Africa is raising international alarm. Still, experts stress that the chance of a pandemic is low

Screen time limits can protect children’s health, U.S. surgeon general advisory says

The Trump administration warned that too much screen time for children is linked to poor sleep, bad behavior and less physical and social activity

Pigeons and People Have Been Frenemies for Longer Than You Think

RACHEL NUWER

Bones discovered at an archaeological site in Cyprus suggest the birds have been strutting around human settlements since at least 1400 B.C.