L-Theanine: a 4,000 Year Old Mind-Hack
Tony - I never thought I'd say this on HN, but you should totally open up a brick and mortar store.  There's so few places in Chicago to go and get good loose leaf tea, shipping seems silly (I live I guess "you should" is the wrong language.  Perhaps supplant with "it would be incredibly inconvenient but way cool if you were to"