Changes in guidance and science seem to have little impact on millions of devastated lives. It’s a social crisis playing out behind closed doors, says Guardian columnist George Monbiot

Researcher says sightings of the endangered moth have increased over the last two years but ‘this year has blown them out of the water’

A Little Tooth - Your baby grows a tooth, then two,

A decades-old rule about human friendship turns out to be built on such shaky math that it could just as easily be 2 or 520.

Cosmic radiation comes from space. Only a small amount reaches the Earth's surface, but exposure is greater for people flying at high altitudes.