If cannabis does impact memory, research shows impairment can be reversed with abstinence, say British researchers Ian Hamilton and Elizabeth Hughes.

Downs, who hosted the game show "Concentration" and the ABC News show "20/20" during a radio and television career of more than 60 years, died Wednesday, according to a statement from his family that was quoted by several U.S. media outlets.

It's the first Monday after time change weekend. Scott Thompson says it's the day you feel like a bear coming out of hibernation — more hungry and stupid, then pooped.