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In sea urchin and salmon sperm, pH value regulates whether they remain immotile or swim

Last nuclear weapons limits expired—pushing world toward new arms race

Pecans found to improve cholesterol and boost heart health

New oxygen gel could prevent amputation in diabetic wound patients

Carefree bachelor or incel: Men are judged for being single, too

Science journalism on the ropes worldwide as U.S. aid cuts bite

Triceratops had a giant nose that may have cooled its massive head

A simple water shift could turn Arctic farmland into a carbon sink

Flea and tick treatments for dogs and cats may be harming wildlife

Frozen for 5,000 years, this ice cave bacterium resists modern antibiotics

The greatest risk of AI in higher education isn't cheating—it's the erosion of learning itself

Occupy Mars? Or the moon? Get a reality check on Elon Musk's plans

Five ways that AI could be reshaping your relationship with money

Is teasing playful or harmful? It depends on a number of factors

Tomb more than 1,000 years old found in Panama

Natural selection can work at many levels, from molecules to ecosystems

Engineered nanoparticles could deliver better targeted cancer treatment to lymph nodes

A trillionth of a second: How lasers may sharpen next-gen cryo-ET microscopy

Metamaterial image sensor keeps colors clear even under oblique light

Antarctic drilling peers deep into ice shelf's past

Water is bed bugs' kryptonite: The parasites avoid wet surfaces at all costs

From pets to precision medicine: Study finds striking parallels in feline and human cancers

Cosmic curveball: Distant system challenges planet-formation theory

Species on east–west coastlines are more likely to go extinct than those on north–south shores—new study

158 giant tortoises reintroduced to a Galapagos island

Do animals have a future on Hollywood sets?

NASA moon rocket hit by new problem, putting March launch with astronauts in jeopardy

Fish use more energy to stay still than previously thought

Australian sea lion pups learn diving and foraging skills from their mothers

2-month-olds see the world in a more complex way than scientists thought, study suggests

These shy, scaly anteaters are the most trafficked mammals in the world

NASA reveals new problem with Artemis II rocket, further delaying launch

Algorithmic grading in class: What a study shows about extra student workload and privacy

Greenland ice melt surges unprecedentedly amid warming

Cosmologists collaborate to sharpen measurements of the Hubble constant

Are one in 200 men really related to Genghis Khan? Maybe not, according to a new study

For thousands of years, solar eclipses have been associated with the fate of rulers

“Celtic curse” hotspots found in Scotland and Ireland with 1 in 54 at risk

Mirror image pheromones help beetles 'swipe right' to find mates

Earliest evidence of indigo-dyed textiles and single-needle knitting discovered in Bronze Age Anatolia

Saturday Citations: A virus that makes its own proteins; a new Spinosaurus; exercise beats anxiety

Scientists discover why high altitude protects against diabetes

Q&A: Gas fermentation could be game changer for the circular economy

New microscopy technique lets scientists see cells in unprecedented detail and color

How your body senses cold—and why menthol feels cool

Sometimes less is more: Messier nanoparticles may actually deliver drugs more effectively than tightly packed ones

A low-cost microscope to study living cells in zero gravity

How tuberculosis bacteria use a 'stealth' mechanism to evade the immune system

A hidden reason inner ear cells die—and what it means for preventing hearing loss

This itch-triggering protein also sends signals to stop scratching