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In this undated handout photo provided by Heinrich Heine University Duesseldorf in January 2026, a blacktip reef shark swims at Sealife Oberhausen in Oberhausen, Germany. (Maximilian Baum/Heinrich Heine University Duesseldorf via AP)

Sharks are famous for fearsome teeth, but ocean acidification could make them weaker

4:05 AM on Friday, January 16

A group of German scientists tested the effects of a more acidic ocean on sharks’ teeth and found that future generations of sharks could have weaker teeth because of changing ocean chemistry

This undated image provided by Communications Earth and Environment shows the mummified remains of a cheetah. (Ahmed Boug/Communications Earth and Environment via AP)

Mummified cheetahs found in Saudi caves shed light on lost populations

8:06 AM on Thursday, January 15

Scientists have uncovered mummified remains of cheetahs from caves in northern Saudi Arabia

Roscosmos cosmonaut Oleg Platonov, left, NASA astronauts Mike Fincke, Zena Cardman, and JAXA (Japan Aerospace Exploration Agency) astronaut Kimiya Yui are seen inside the SpaceX Dragon Endeavour spacecraft onboard the SpaceX recovery ship SHANNON shortly after having landed in the Pacific Ocean off the coast of Long Beach, Calif., Thursday, Jan. 15, 2026. (NASA via AP)

Ailing astronaut returns to Earth early in NASA's first medical evacuation

12:45 AM on Thursday, January 15

An ailing astronaut is back on Earth

Ailing astronaut returns to Earth early with three crewmates from the International Space Station

12:42 AM on Thursday, January 15

Ailing astronaut returns to Earth early with three crewmates from the International Space Station

This photo provided by NASA shows clockwise from bottom left are, NASA astronaut Mike Fincke, Roscosmos cosmonaut Oleg Platonov, NASA astronaut Zena Cardman, and JAXA (Japan Aerospace Exploration Agency) astronaut Kimiya Yui gathering for a crew portrait wearing their Dragon pressure suits during a suit verification check inside the International Space Station’s Kibo laboratory module, Wednesday, Jan. 14, 2026. (NASA via AP)

NASA sends 4 astronauts back to Earth in first medical evacuation

2:22 PM on Wednesday, January 14

An astronaut in need of medical care is on the way back to Earth

Four astronauts depart the International Space Station in NASA’s first medical evacuation from orbit

2:20 PM on Wednesday, January 14

Four astronauts depart the International Space Station in NASA’s first medical evacuation from orbit

This undated image released on Wednesday, Jan. 14, 2026 by the Ice Memory Foundation, shows the Concordia Station, where the Ice Memory Sanctuary is being built in Antarctica for ice cores from the Alps carrying the memory of Earth's current atmosphere, which are preserved at a temperature close to -52°C/-61°F for future generations of scientists to study. (ENEA PNRA via AP)

A novel sanctuary in Antarctica is preserving ice samples from rapidly melting glaciers

5:47 AM on Wednesday, January 14

Scientists have inaugurated the first global repository of mountain ice cores in an Antarctic vault

CA-INTEGRATED-DNA

5:05 AM on Wednesday, January 14

Iranian state television acknowledges high death toll in nationwide protests, saying country had ‘a lot of martyrs’

8:21 AM on Tuesday, January 13

Iranian state television acknowledges high death toll in nationwide protests, saying country had ‘a lot of martyrs’

CO-ARROW-ELECTRONICS

6:45 AM on Tuesday, January 13

CA-TONKEAN

6:00 AM on Tuesday, January 13

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