Researchers have found the pupil is key to understanding how, and when, the brain forms strong, long-lasting memories.

A stage of sleep – reflected in the size of our pupils – is important to committing recent memories to the brain, which could ...

A tiny new arrival at an Ohio zoo was “the size of a golf ball” at birth. Throughout the armadillo pup’s first three weeks of life, the zoo has kept track of the creature’s growth — which has been ...