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Life

Bacteria can cause pain on their own

Microbes caused discomfort in mice by activating nerves, not the immune system.

Animals

Birds know road speed limits

Crows, house sparrows and other species judge when to flee the asphalt by average traffic rates rather than an oncoming car's speed.

Psychology

Blood marker may predict suicide

People who killed themselves had higher levels of a gene involved in cell death.

Astronomy

Pictures of young star show unusual outbursts

Ejections from stellar newborn move faster and in different directions than astronomers thought.

Ecosystems

Aging European forests full to the brim with carbon

Trees' capacity to sequester carbon dioxide from the atmosphere is dwindling.