More than 5,500 silver coins buried by a river about 1,800 years ago are now in the hands of archaeologists, following the hoard's discovery in Augsburg, Germany.At the time of the coins' burial, the Roman Empire was in full swing, with its coinage reaching all corners of its territory and beyond.These coins "are denarii, the standard silver denomination during the 1st-early 3rd century [A.D.]," Stefan Krmnicek, a professor of ancient numismatics (the study of coins) at the University of Tübingen in Germany, told Live Science in an email.Archaeologists found the hoard earlier this year in an old riverbed. But though...