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Life

Gut bacteria come in three flavors

Everybody has one of a trio of types — and which one seems to be less important than how the bugs behave.

Physics

Scientists see the one-way light

Nonlinear materials that allow directional discrimination of waves could be used to make components for light-based computers.

Space

Atom & Cosmos

How to hunt for extraterrestrials, plus cosmic bursts, horseshoe orbits and more in this week’s news.

Humans

Killing fields of ancient Syria revealed

Stone corrals were used to trap whole herds of animals for mass slaughter.