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91av. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

Health

Why US obesity rates fell for the first time in decades

After years of rising obesity rates in the US, the numbers dipped slightly during 2023, though experts disagree about the exact cause

News

False-colour scanning electron micrograph of skin from the palm of the hand of a 30 year old man. The skin here is neatly arranged in ridges. Sweat pores are seen as miniature craters along the ridges. The cells forming the external surface of the skin, or epidermis, have been flattened & hardened by deposition within them of the fibrous protein keratin. This tough, dead layer of cells is shed continuously & is replaced by new, maturing cells which take a month to migrate from the base of the epidermis. Magnification: x20 at 6x4.5cm size

Health

Forget aesthetics, the reason to look after our skin should be health

Leader

B6DT04 Alzheimers disease. Series of computed tomography (CT) scans of an axial section through the head of a 74-year-old patient.

Health

We'll learn about Ozempic's potential for Alzheimer's disease in 2025

News

Why looking after your skin is so crucial to your long-term health

Health

Why looking after your skin is so crucial to your long-term health

Features

SWITZERLAND. St Moritz. 2003.

Health

Should you really wear sunscreen all year round, even in winter?

Features

Close up color image depicting freshly cooked take away vegetarian vegan food.

Health

What should we eat to give us better, healthier skin

Features

CXRC8E People taking a mud bath, spa on Lake Koycegiz, Sultaniye, near Dalyan, Mugla Province, Turkey, Asia Minor

Health

How to nurture your microbiome to look after your skin

Features

Microneedling demonstration by Dr. Jimmy Poon where a number of local Estheticans were introduced to the procedure that some see as unsafe.Dr Poon uses the Microneedle roller on the face of Esthetician Karen Clarke.(October 30 11)RICK EGLINTON/TORONTO STAR. (Photo by Rick Eglinton/Toronto Star via Getty Images)

Health

What the evidence says about the consequences of cosmetic tweakments

Features

DARMSTADT, GERMANY - MARCH 19: A student sits the English school leaving examination (Abitur) at the Berthold Brecht School on March 19, 2020 in Darmstadt, Germany. It is the first day of the university-entrance diploma exams in Hesse. Due to the coronavirus outbreak, all schools in Germany are closed, however, it has been decided that the Abitur should take place with the necessary safety precautions in place. Everyday life in Germany has become fundamentally altered as authorities tighten measures to stem the spread of the coronavirus (COVID-19). (Photo by Thomas Lohnes/Getty Images)

Health

How your mental state and stress levels influence your skin

Features

A customer walks down a skincare aisle at an Ulta Beauty Inc. store in New York, U.S., on Thursday, May 31, 2018. Ulta reported late Thursday??that its comparable sales rose 8.1 percent in the first quarter from??a year earlier. The increase was driven by all the right things: A booming 48 percent increase in digital sales,??as well as 5.1 percent growth in transactions and a 3 percent increase in average ticket. Photographer: Gabby Jones/Bloomberg via Getty Images

Health

The only four skincare ingredients that have been proven to work

In the quest for better skin, we are faced with an overwhelming choice of creams and serums to enhance our appearance. Here's what works – and what doesn't

Features

Health

Will an mRNA vaccine target the norovirus strain behind surging cases?

News

Health

Is social media fuelling a rise in eating disorders?

Analysis

Health

Plastic chemicals linked to hundreds of thousands of deaths worldwide

News

Health

Mpox became a global health emergency for the second time in 2024

News