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Archaeology

60,000-year-old poison arrowheads show early humans’ skillful hunting

A new analysis uncovers traces of poison on the South African arrowheads, pushing back the timeline for poisoned weapons by more than 50,000 years.

Space

Betelgeuse’s buddy leaves a wake in the giant star’s atmosphere

The wake left by Betelgeuse’s companion could solve a decades-old mystery of its strange brightness cycles.

Astronomy

Galaxies with ‘hoop skirts’ are more common than we thought

The discovery of thousands more galaxies with stars ringing their main disks could help astronomers study galactic evolution more generally.

Physics

Here’s the science behind nuclear weapons testing

Nuclear weapons haven’t been tested in the United States since 1992.