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The mix of wildfire smoke and urban air pollution could increase ozone levels in the western United States, according to new research.https://www.sciencenews.org/article/wildfire-smoke-toxic-ozone-urban-air-pollution-cities …

A lot of our favorite books this year were about origins—the origins of the Big Bang theory as an idea, the origins of the opioid crisis, the origins of CRISPR/Cas 9 gene editing.https://www.sciencenews.org/article/favorite-top-science-books-2021 …

Humankind evolved in many places as ancient groups crossed paths.https://www.sciencenews.org/article/human-evolution-mating-2021-research …

So far, the data suggest psychedelics work quickly, appear to be safe and have lasting effects. “That is hard to come by. I think that is extremely exciting.”https://www.sciencenews.org/article/psychedelic-drugs-treatment-mental-health-disorders-depression …

Vulture bees will feed on pretty much any dead animal.https://www.sciencenews.org/article/vulture-bees-gut-bacteria-eat-rotting-flesh-sick …

“Humanity has touched the sun.”https://www.sciencenews.org/article/parker-solar-probe-sun-atmosphere-first-spacecraft …

Ingenuity is flying farther, faster and higher than it did in its first few flights.https://www.sciencenews.org/article/ingenuity-helicopter-flying-mars-perseverance-nasa …

This newly described form of renewal offers insights into how to design biological machines that are self-perpetuating.https://www.sciencenews.org/article/tiny-living-machines-xenobots-replicate-copies-frog-cells …

“We may be seeing the birth of a black hole or neutron star.”https://www.sciencenews.org/article/cow-neutron-star-black-hole …

Nodding off may turn creativity on.https://www.sciencenews.org/article/sleep-creativity-neuroscience-brain …

Neandertals turned a European forest into grasslands.https://www.sciencenews.org/article/neandertals-first-hominid-modify-environment-forest-grassland …

A crucial ice shelf that’s holding Thwaites Glacier back is about to collapse, scientists say.https://www.sciencenews.org/article/antarctica-thwaites-glacier-ice-shelf-collapse-climate-5-years …

Today, doctors in the United States order more than 80 million scans per year. X-ray computed tomography, or CT, is frequently the quickest way of getting a handle on what’s causing a mysterious woe.https://www.sciencenews.org/article/ct-scan-50-years-anniversary-first-image-medicine-physics …

We highlighted just a handful of ways that advances in materials over the last century have transformed our daily lives. We've focused on travel, connectivity and convenience. We could have chosen countless others. #SN100https://www.sciencenews.org/century/materials-plastics-polymers-fiber-optics-history …

Imaginary numbers seem to be woven into the fabric of quantum mechanics.https://www.sciencenews.org/article/quantum-physics-imaginary-numbers-math-reality …

This wasn’t cicada science’s first pandemic. Just look back at 1919.https://www.sciencenews.org/article/cicada-science-brood-x-2021 …

Land cleared of tropical forests often is abandoned after a few years of low-intensity agricultural use, allowing nature to creep back in.https://www.sciencenews.org/article/tropical-forest-recovery-ecosystem …

Scientists observed the pair of pulsars for over 16 years.https://www.sciencenews.org/article/pulsar-dead-stars-general-relativity-einstein …

2021 has been the year of learning the limits of the vaccines’ superpowers.https://www.sciencenews.org/article/covid-coronavirus-vaccines-review-pandemic-2021 …

Bacteria don’t always have evolution on their side when trying to escape death-by-virus.https://www.sciencenews.org/article/bacteria-virus-phage-shigellosis-arms-race …