I've only made 3 brews to date (so my experience isn't much), but every recipe I follow makes no mention of the AAU on the hops I need. They only list them by name. Are AAU's an un-needed known? I understand what they stand for, and it seems like it would be important to note on the recipe, so I'm keeping record of it in my brewday notes. The lady in the LBS keeps asking me what AAU I need, and I never know what to tell her. Also, does anybody know of a website where I can download a chart or something for hops percentage of bittering usage based on boil time?