A ninety minute daytime nap helps speed up the process of long term memory consolidation. Long term memory is defined as a permanent memory that doesn't disappear or that disappears after many years. This part of our memory is divided into two types -- memories of "what" (for example: what happened yesterday or what one remembers from an article one read yesterday) and memories of "how to" (for example: how to read Hebrew, how to drive, play basketball or play the piano).

Bill Gates, the outgoing chairman of Microsoft, had little that was interesting or innovative to show off in his last annual keynote at C.E.S. in Las Vegas on Sunday.