News

Health & Medicine

Serotonin lower in shift workers

Workers who rotate between day and night shifts have less of the brain chemical serotonin than day shift workers do.

Earth

Beware summer radon-test results

Measuring household radon levels in summer may give misleadingly low results.

Astronomy

Veiled black holes

Many X ray sources in the sky could be active galactic nuclei smothered by gas and dust that blocks their emission of visible and ultraviolet light.

Materials Science

Pliable carbon

The layers of carbon atoms that form graphite can be assembled into strong but flexible "graphene paper."