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Rivers around the world are quietly running out of oxygen -- and climate change is emerging as the main culprit. A sweeping global analysis of more than 21,000 river systems found that nearly 80% have been steadily losing dissolved oxygen over the .. ...

Exercise may be training your brain just as much as your body. Researchers discovered that certain brain cells stay highly active even after a workout ends, and those lingering signals appear to help the body build endurance over time. In experiments ...

Researchers have shown for the first time that malfunctioning mitochondria -- the cell's energy generators -- may directly cause cognitive decline in neurodegenerative diseases. By creating a new tool that temporarily boosts mitochondrial activity in ...

Astronomers have revealed the sharpest image ever captured of a filament in the cosmic web -- the enormous hidden structure connecting galaxies across the Universe. The glowing strand stretches 3 million light-years and links two galaxies from nearly ...

A major analysis of brain scans found that people with anxiety disorders have noticeably lower levels of choline, a nutrient crucial for healthy brain function. The strongest evidence appeared in the prefrontal cortex, the region tied to emotional .. ...

A stunning fossil discovery in Ethiopia shows that early Homo and a previously unknown Australopithecus species lived together around 2.6 to 2.8 million years ago. The find overturns the classic "ape-to-human" progression and paints human evolution . ...

A mysterious underwater fault near Ecuador has been producing nearly identical magnitude 6 earthquakes every five to six years, baffling scientists for decades. Researchers now believe the fault contains hidden "brake zones" where seawater and ...

A new study suggests microscopic particles from the gut may actively drive inflammation and chronic diseases associated with aging. Remarkably, gut particles from young animals appeared to counter some aging-related damage in older animals, hinting . ...

Scientists are uncovering a surprising link between hidden tooth infections and blood sugar problems. Deep infections around tooth roots can create chronic inflammation that spreads through the body and may interfere with insulin function. Studies .. ...

You may not need hours at the gym to boost your health after all. Researchers say just 30 minutes of high-intensity exercise per week -- broken into tiny bursts of effort that leave you out of breath -- can dramatically improve cardiovascular fitness ...