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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

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

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

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

How travel and dating apps are changing relationship rules for queer men

Minnesota is falling short on its climate goals, new state data shows

1,100 dead or sick geese in NJ spark bird flu warning, prompt lake's closure

Pushing the right buttons: Fern guides its embryo's sense of up and down

In Tampa, storm-weary residents detail the costs of extreme weather

Linguist explains how AI makes fake news more credible

Australia's happiness crisis could cost us our global mojo

Endangered Kenyan antelopes rescued after being stranded at Palm Beach airport

A rethink is needed on zero-tolerance school behavior policies