A well-written series of articles on the science of Harry Potter has been put up at ponder pikaia. I've rounded them all up here in case any are interested.
#1: Wizarding genetics
#2: Dracorex hogwartsia
#3: conservation biology
#4: the botany of wands
#5: kin selection
#6: the giant squid in the lake
#7: Horcruxes
#8: Scar Biology