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Chemistry

Drug smugglers leave cellular tracks

Imaging reveals where some experimental nanoscale capsules ferry drugs when they enter cells.

Astronomy

A black hole that goes the distance

Astronomers have measured the mass of the most distant black hole known.

Paleontology

Ancient wood points to arctic greenhouse

Chemical analyses of wood that grew in an ancient arctic forest suggest that the air there once was about twice as humid as it is now.

Health & Medicine

Fecal glow could improve meat safety

Workers who process animal carcasses into meat might soon use a novel type of laser scanner to identify products that have been contaminated with feces.