MRI scan showing a human brain. Researchers have successfully shut down brain swelling in a rodent brain by turning off a single gene.  Photograph: Getty Images

Researchers have identified a biological switch that shuts down brain swelling after a head injury or stroke. The discovery has widespread medical imp(...)

People queing to play the Lotto in the St Stephen’s Green Shopping Centre in Dublin. Photograph: Eric Luke.

More than half the population played National Lottery games on a regular basis last year, but in reality there is almost no probability of winning big(...)

An image from the Department of Education as part of an anti-bullying campaign.

My first encounter with everyday sadism came in the form of a teacher who was at his happiest when administering punishment to his pupils.This punishm(...)

Up close and personal: the mountain pine beetle, currently wiping out thousands of square miles of pine forest. Photograph: Ward Strong, British Columbia Ministry of Forests, Lands, and Natural Resource Operations

A troublesome beetle is munching its way through square miles of pine trees in North America, wreaking havoc in an area of forest 10 times larg(...)