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

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Health

Hormone replacement therapy may be safe after breast cancer treatment

Hormone replacement therapy was thought to increase risk of cancer recurrence after breast cancer treatment, but that may not be the case

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Polarised light micrograph of serotonin crystals

Health

No link between depression and serotonin, finds major analysis

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A person takes samples from Marseille sewage water near a retirement home in France to detect covid-19 traces in December 2020

Health

Sewage surveillance spots new covid-19 variants as effectively as PCRs

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NEW YORK, NY - JUNE 08: Passengers wear masks at the subway during rush hour on June 08, 2021 in New York City. New York City's subways are now operating 24-7 as Covid-19 cases have dropped and more Americans receive the vaccination for Covid-19. (Photo by Robert Nickelsberg/Getty Images)

Health

How to cut your risk of catching the BA.4 and BA.5 covid subvariants

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Sign showing temperature of 43°C.

Health

Why are heatwaves dangerous and how does extreme heat affect the body?

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Sperm cells

Health

What we know so far about how covid-19 affects sperm

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X and Y chromosome

Health

Risk of heart failure may increase with age due to Y chromosome loss

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Nader Moazami, MD, (right) surgical director of heart transplantation at the NYU Langone Transplant Institute, and cardiothoracic physician assistant Amanda Merrifield prepare to remove the heart from a recently deceased donor on Wednesday, July 6, 2022, in New York, NY.

Health

Modified pig hearts transplanted into dead people kept on life support

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Light micrograph of a section through the seminiferous tubules, the site of sperm production

Health

Tiny bubbles in semen could contribute to ‘unexplained infertility’

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Male friends eating pizza with beer on street

Health

Men may eat more in summer because sunlight makes them hungrier

Sunlight hitting the skin seems to boost secretion of an appetite-boosting hormone in men, causing them to eat more in summer – but women aren't affected in the same way

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Health

Infertility in some men may be caused by X chromosome mutations

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Health

UK's latest omicron wave being driven by BA.4 and BA.5 covid variants

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Health

We really can become ‘hangry’, suggests first real-world test of idea

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Health

Drugs used to treat ADHD and depression may ease Alzheimer's symptoms

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