I hadn’t really thought about food archaeology much until one day in the car. I was sitting idle in the Saturday morning traffic on the Pacific Highway listening to the radio. Simon Marnie on ABC 702 was talking about beer that had been brewed from yeast salvaged from 220 year old Tasmanian shipwreck. Not too long later, I heard about an American who ate a cracker from the Civil War. So how old is too old to eat?