New explanation for universe's infrared glow

Dark matter halos — the huge, invisible cocoons of mass that envelop entire galaxies and account for most of the matter in the universe — may not be so dark after all.

NASA spots glow of universe's first objects

NASA believes it's spotted the dappled light of the first objects in the universe with the best precision yet.

Patients' nerves made to glow during surgery

Damaging a patient's nerves during surgery can cause agony - and even paralysis. But nerves are rather hard to see.