Taken off some website: [quote]Sour tastes - think of 'sharp' fruit such as lemons and limes, or unripe fruit before it becomes sweet. Bitter - hard to explain as I don't go out of my way to eat anything bitter. It's a strong unpleasant taste that sort of'dries out' your mouth. Not quite the same as sour (which tends to make you dribble. Or is that just me?) Beer is bitter.[/quote]