Social media has been a boon to autocratic regimes and their allied movements in democracies.

The descent of stable societies into ones of endemic violence rarely produces anything but new forms of tyranny and terror.

Physicists have long struggled with their goal of making gravity a quantum force. A radical post-quantum approach might solve that problem – and clear up other cosmic mysteries, too

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

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’

One in 60 adults Fiji lives with HIV but a recent emergency declaration may help address key issues such as syringe sharing