Three thought experiments involving “demons” have haunted physics for centuries. What should we make of them today?

The idea that a hidden fourth dimension could be woven into everyday reality is no longer just a science‑fiction trope.

For nearly a century, dark matter has been the invisible scaffolding of the universe, inferred from its gravitational pull ...

All experiments broke records in the final full operating year of the third run of the LHC.

Observations of the formation of light-nuclei from high-energy collisions may help in the hunt for dark matter.