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Volunteers working in soup kitchen

Life

No more goody two shoes: Why true altruism can’t exist

If only the fittest survive, why do good deeds for no return? The enduring mystery of altruism goes to the heart of how evolution does – and doesn't – work

Features

Indian elephant mother with young drinking in water a

Life

Female Asian elephants mysteriously stop reproducing later in life

News

Mouse studies could help us better understand how embryos develop

Health

Early mouse fetuses generated without sperm or eggs for first time

News

Daily hormone cycles might affect mood and fertility

Health

Women have a daily hormone cycle as well as a monthly one

News

Parents of young children have less sleep, money and free time

Mind

Having kids makes you happier, but only when they move out

News

In some countries, more than 107 boys are born for every 100 girls

Health

Sperm sorting method could prevent girls being born, scientists warn

News

IVF

Technology

IVF add-ons are a waste of money – fertility clinics should ban them

Comment

jellyfish

Life

Some jellyfish sperm have stingers that fire inside females

News

Sex

Definition

Sex

Indian wall painting about menstruation

Health

The pioneering podcast that's breaking the silence on women's health

From IVF to miscarriage, the podcast She Says She's Fine wants women to share their intimate secrets and get informed about sexual and reproductive health

Culture

Life

Long penises help hermit crabs avoid being robbed during sex

News

Life

Core set of genes explain why some animals stick to one mate at a time

News

Life

Some spiders produce milk – and it’s more nutritious than cow’s milk

News

Health

Catching up on sleep at weekends may aggravate period pain

News