Yup, humans chewed gum that long ago. By Story at a glance Archeologists in Denmark are excavating a site near an ongoing project to build an underwater tunnel. Researchers were able to extract an ancient human genome from a 5,700-year-old piece of chewing gum. Evidence suggests the human who chewed the gum was a woman with dark skin, dark hair and blue eyes. Thousands of years before there was Trident gum or Hubba Bubba, human beings chewed other sorts of gum — including birch pitch, a black-brown substance produced by heating birch bark. In Denmark, archaeologists have...