Image via Wikimedia Commons As a beverage of choice and necessity for much of the population in parts of the ancient world, beer has played an important role in archaeology. Beer cans, on the other hand, have not. Unlike millennia-old recipes , beer cans seem like no more than trash, even in a field where trash is highly treasured. This is a mistake, says archeologist Jane Busch . “The historical archaeologist who ignores the beer can at his site is like the prehistoric archeologist who ignores historic pottery.” David Maxwell, an expert in animal bones who trained as a Mayanist, has recognized the truth of this statement by turning his passion for beer can collecting into beer can archaeology, a tiny niche within the smaller field of “tin can archaeology.” Maxwell became the reigning expert on beer can dating when “in 1993, he published a field-identification guide in Historical Archaeology,” notes Jessica Gingrich at Atlas Obscura , “which has since become an industry standard an...