Anita Radini, an archaeologist at the University of York, in England, spends a lot of time looking at tartar. Really old tartar.
Tartar, or dental plaque -- that film of bacteria that feels like sweaters on your teeth -- contains a wealth of information about what long-dead individuals encountered in their daily lives. Dr. Radini has seen all sorts of things trapped in it: food particles, textile fibers, DNA, pollen, bacteria and even wings of tiny insects.
But several years ago, ...
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