Is Umami The Key To Human Happiness?
"Although glutamate was discovered in 1908, it wasn't until the 1980s that it came to be described as 'umami', the fifth flavor. It is a savory taste, to go along with our other flavors of sweet, salty, bitter and sour. ... Our hero scientist Dr. Kanye West (no, the other Kanye West) wonders: is there a link between umami and human happiness?"
Scientific American 01/07/13 (includes video)