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Space

How two gamma-ray bursts created record-breaking high-energy photons

Light packing up to 1 trillion electron volts of energy bolsters a theory for how these cosmic explosions produce such high-energy radiation.

Health & Medicine

Dengue cases in the Americas have reached an all-time high

There have been more dengue cases in the Americas this year than ever before, according to the Pan American Health Organization.

Neuroscience

Some people with half a brain have extra strong neural connections

Brain scans of six people who had half their brains removed as epileptic children show signs of compensation.

Life

Caribou migrate farther than any other known land animal

Caribou in Alaska and Canada migrate up to 1,350 kilometers round trip each year, a study reports.