According to a statement released by the Public Library of Science, a new study of the 2,400-year-old Hjortspring boat, discovered with a cache of weapons in the early twentieth century on Denmark's island of Als, suggests that it may have been constructed in the Baltic Sea region. First, Mikael Fauvelle of Lund University and his colleagues radiocarbon dated cording and caulk found with the boat to the fourth or third century B.C. Then, they used gas chromatography and mass spectrometry to determine that the caulk had likely been made of animal fat and pine pitch. At the time, there were...