In addition to a Neolithic monument, the builders of Stonehenge left behind something a little less celebratory: fossilized clumps of poop. A new analysis of these so-called coprolites suggests that during epic winter feasts, the ancient workers and their dogs ate undercooked meat littered with the eggs of parasitic worms.  The team of researchers uncovered the fossilized "poop balls" in a refuse heap at Durrington Walls — a Neolithic settlement situated around 1.7 miles (2.8 kilometers) fr