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A DAY AGO
E.P.A. Clears a Weedkiller, Saying It Won’t Push Species to Extinction
The finding effectively paves the way for continued use of atrazine, a widely used herbicide that has been linked to birth defects and cancer in humans.
- SCIENTIFIC AMERICANA DAY AGO

The U.S. just experienced its hottest 12 months on record
March was a scorching 9.35 degrees Fahrenheit hotter than the 20th-century average for the month, capping the hottest 12-month stretch for the U.S. since records began in 1895
- SCIENTIFIC AMERICANA DAY AGO

Summerlike heat is breaking records in the East. Here’s why
A Bermuda High parked over the western Atlantic is pulling sweltering air up from the South, challenging records in parts of the eastern U.S.
- SCIENTIFIC AMERICAN11 HOURS AGO

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
- SCIENTIFIC AMERICAN10 HOURS AGO

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
- SCIENTIFIC AMERICAN7 HOURS AGO

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
A DAY AGO
Ebola Was Identified in Congo Weeks Before W.H.O. Declared an Emergency
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.
11 HOURS AGO
Europe’s Green-Energy Future Has a Reindeer Problem
In northern Norway, Sami people fear a copper mine will disrupt their traditional lifestyles.
A DAY AGO
Scientists Tweaked the Global Warming Outlook. So Trump Weighed In.
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.
- SCIENTIFIC AMERICAN6 HOURS AGO

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
A DAY AGO
E.P.A. to Repeal Some Limits on ‘Forever Chemicals’ in Drinking Water
The rules were established by the Biden administration after research linked the compounds to a range of serious health problems.
4 HOURS AGO
Ebola Crisis Sparks Debate Over Global Health Double Standards
To some Africans, the claim that the continent’s largest health agency had already bungled its response scratched a familiar wound.
- SCIENTIFIC AMERICAN4 HOURS AGO

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
2 HOURS AGO
This Moon of Neptune Might Have Survived a Wrecking-Ball Event
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.
- SCIENTIFIC AMERICAN2 HOURS AGO

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