Plaque on 3700 year old teeth shows what people ate and reveal a trade network.

 The stuff they scrape off your teeth at the dentist is a petrified residue from bacteria.  In that calcareous plaque, specks of food are trapped.  Researchers at the ancient city of Megiddo in modern day Israel have examined teeth of a dozen bronze age people.  They found turmeric and bananas and soy and proof of trade out of Asia centuries, even more than a thousand years earlier than previously guessed.  Science Daily News.