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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

Our expert reviewer testing the workout features on the Garmin Fenix 8 smartwatch

Best fitness trackers 2026: From smart rings to multisport GPS watches

By Andrew Williams, Anna Gora last updated

Buying Guide These are the best fitness trackers you can buy in every category, from Amazfit Balance and Garmin Fenix 8 to Whoop MG.

Buying Guide

This 'marker' may be more predictive than cholesterol for heart disease

By Mary J. Scourboutakos published

C-reactive protein — a marker of inflammation — is as easily measured with blood work in a doctor’s office as cholesterol.

Heart & Circulation
The Saucony Ride 15 running shoes being tested during our full review

Best running shoes for supination 2026: Find the perfect fit for your feet

By Harry Bullmore last updated

Buyers guide These are the best running shoes you can buy in every category, from New Balance 1080 v14 and Asics Megablast to Hoka Mach X.

Buyers guide
A smiling woman exercising on a cross-trainer at home

Best exercise machines for weight loss 2026

By Ruth Gaukrodger last updated

BUYING GUIDE Our favorite cardio machines, from the iconic Peloton bike to the meaty NordicTrack X22i treadmill.

BUYING GUIDE
Our expert fitness reviewer testing the NordicTrack x22i treadmill

Best treadmills 2026: Rack up the miles in the comfort of your own home

By Harry Bullmore, Anna Gora last updated

BUYING GUIDE These are the best treadmills you can buy in every category, from NordicTrack x22i and Mobvoi Home Treadmill to Peloton Tread.

BUYING GUIDE
Our expert fitness reviewer testing the Aviron Tough Series Rower

Best rowing machines 2026: Full-body workout in the comfort of your home

By Harry Bullmore, Anna Gora last updated

Buying Guide These are the best rowing machines you can buy in every category, from Concept2 RowErg and Ergatta Rower to Hydrow Wave.

Buying Guide
A group of women riding on exercise bikes in the gym

Best exercise bikes 2026: From budget options to premium smart bikes

By Sam Hopes, Anna Gora last updated

Buying Guide These are the best exercise bikes you can buy in every category, from the Peloton Bike and YOSUDA Bike to the Schwinn IC4.

Buying Guide

If 'swimming more' is one of your New Year's resolutions, the FORM Smart Swim 2 will keep you in the right lane.

By Tantse Walter published

Deals Now priced under $200, these goggles can improve your swimming technique and efficiency, providing real-time data as you swim.

Deals

How common is it to have extra bones in your skeleton?

By Charles Q. Choi published

Adult human bodies typically have about 206 bones. But is it possible to have more?

Health

An experimental mRNA treatment counters immune cell aging in mice

By Nicoletta Lanese published

A trio of mRNA molecules could help guard against the harmful effects of aging on immune cells, a study in mice finds.

Immune System
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