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an illustration of men and women with their brains superimposed over the heads — Is there really a difference between male and female brains? Emerging science is revealing the answer. Brain scans, postmortem dissections, artificial intelligence and lab mice reveal differences in the brain that are linked to sex. Do we know what they mean?

A close-up of a doctor loading a syringe with a dose of a vaccine — 'Vaccine rejection is as old as vaccines themselves': Science historian Thomas Levenson on the history of germ theory and its deniers Live Science spoke with author Thomas Levenson about his new book on the history of germ theory.

An illustration of colorful lines converging to make the shape of a human iris and pupil — Scientists hijacked the human eye to get it to see a brand-new color. It's called 'olo.' Using an experimental technique called "Oz," researchers stimulated the human retina such that people saw a brand-new color.

Latest about Health

A man working in front of a laptop while taking steps on one of the best walking treadmills

Best walking treadmills 2025: Get moving with these handpicked treadmills

By Sam Hopes last updated 25 April 25

These are the best walking treadmills you can buy in every category, from Mobvoi Home Treadmill to Bluefin Fitness Task 2.0 Treadmill.

Exercise

A woman running on a treadmill in a living room

Best treadmills 2025: Tried and tested by our fitness experts

By Harry Bullmore, Anna Gora last updated 25 April 25

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

Cyber Monday under desk treadmill deals: Man walking on under desk treadmill in an office

Under desk treadmill deals: Save money and exercise while you work

By Kate Carter last updated 25 April 25

Buying guide Bring movement into your work day: Get your steps in while at work with these under desk treadmill deals.

Buying guide

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

Best running shoes for supination 2025: Find the perfect fit for your feet

By Harry Bullmore last updated 25 April 25

Buyers guide These are the best running shoes you can buy in every category, from Saucony Ride 16 and Brooks Glycerin 20 to Hoka Mach X.

Buyers guide

A smiling woman exercising on a cross-trainer at home

Best exercise machines for weight loss 2025

By Ruth Gaukrodger last updated 25 April 25

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

BUYING GUIDE

Lab-grown teeth could offer alternative to fillings and implants, scientists say

By Jess Thomson published 25 April 25

Scientists in the U.K. have developed a new material that may allow them to grow teeth in the lab, which could provide an alternative to fillings and dental implants someday.

Health

A picture of Ingrida Domarkienė sat at a lab bench using a marker to write on a test tube. She is wearing a white lab coat.

DNA from across the ages can reveal migrations of Iron-Age people and genes that protected against Chernobyl radiation

By Emily Cooke published 24 April 25

Ingrida Domarkienė, a geneticist at Vilnius University in Lithuania, discusses the exciting developments made possible by studying ancient and modern DNA.

Genetics