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image of three human egg cells inside ovarian follicles
Could aging eggs be 'rejuvenated'? New tool may help pave the way to fertility-extending treatments Scientists invented a new experimental system to study how age-related changes in egg cells make them more prone to chromosomal errors.
Asian woman with white skin, gray hair, sitting with her back, Photo of the back.
Gray hair may have evolved as a protection against cancer, study hints Aging comes with graying hair, which may be a sign of the body lowering its risk of cancer, a study suggests.
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Woman with Insomnia. Young woman lying on bed with hand on forehead.
Insomnia and anxiety come with a weaker immune system — a new study starts to unravel why People with anxiety or insomnia tend to have weaker immunity. The decline of a key immune cell may be a culprit.

Latest about Health

Study links GLP-1 use to some pregnancy risks — but the research has key caveats

By Nicoletta Lanese published

A new study hints that pregnant people who have previously taken drugs like Ozempic may face a higher risk of certain poor pregnancy outcomes. But more studies are needed to understand the finding.

Fertility, Pregnancy & Birth

Has America's obesity rate plateaued?

By Stephanie Pappas published

Some recent national numbers suggest the obesity rate has plateaued or even declined. Experts are skeptical.

Health
RFK and a mound of ants

Turmoil at the CDC, NASA's comet 3I/ATLAS image release, and the insect apocalypse.

By Ben Turner published

Science news this week Nov. 22, 2025: Our weekly roundup of the latest science in the news, as well as a few fascinating articles to keep you entertained over the weekend.

Science news this week

Are free radicals really that bad for you?

By Victoria Atkinson published

Free radicals are highly reactive molecules that are missing an electron. They get a bad rap, but could they actually have any benefits?

Health
An orange cat sitting on a sofa next to an air purifier

Best air purifiers for allergies 2025: Breathe easy this winter

By Molly Cleary, Anna Gora last updated

BUYING GUIDE These are the best air purifiers for allergies you can buy in every category, from Levoit Core 600S and Molekule Air Pro to RabbitAir A3.

BUYING GUIDE
An orange cat standing on top of an air purifier

Best air purifiers for pet owners 2025: Remove pet dander, hair and odors

By Tantse Walter last updated

Buying guides These are the best air purifiers for pets, from Levoit Vital 200S and AirDoctor AD3500 to SwitchBot Table Air Purifier.

Buying guides
A close-up picture of our reviewer wearing the Coros Pace Pro watch

We went hiking with the Coros Pace Pro sports watch — It's surprisingly good

By Anna Gora published

Reviews We liked having the Coros Pace Pro as our hiking companion, but we do not think this sports watch will be our go-to option for extreme outdoor explorations.

Reviews

Slaying 'zombie cells' in blood vessels could be key to treating diabetes, early study finds

By Elise Ceyral published

Clearing aged cells from blood vessels could help reduce inflammation, improve blood sugar levels and counter insulin resistance, a mouse study finds.

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Diabetes

'I don't know if CDC will survive, to be quite frank': Former CDC officials describe the disintegration of the agency under RFK

By Nicoletta Lanese published

Three former CDC officials share their experiences at the agency leading up to their resignations.

Health
The Blueair Blue Signature air purifier standing in the middle of a living room

Blueair Blue Signature air purifier review: Powerful and elegant

By Anna Gora published

Reviews Stylish and beautifully illuminated, the Blueair Blue Signature air purifier is a breath of fresh air (literally).

Reviews
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