Some really good seminars from the 2013 American Homebrewer’s Association Conference held in Philadelphia. Especially interesting to me was Because Not Every Beer is Stone Enjoy By IPA: Preserving Hop Aroma by Stan Hieronymus. He talks about aroma stability from first wort to dry hopping and how fermentation changes hop aromas. He also goes over a few studies done by Kirin on using hop substitutions for hard to get hops(Citra, etc) and Sierra Nevada on stability during shipping. Great stuff. Check out AHA National Homebrewers Conference Semiars.