New research suggests the human brain’s memory and learning peak at seven senses—the optimal number for cognition.

Déjà vu—the eerie feeling that a new moment has happened before—has puzzled scientists and philosophers for centuries.

Last time we talked about how the original PC has a limit of 640 kB for your programs and 1 MB in total. But of course those restrictions chafed. People demanded more memory, and there were ...