How does running a mile “just for fun” wind up a reported world best?Somehow it doesn’t seem such a shocking feat for Northbridge wunder-teen Sydney Masciarelli, who with her natural ability and steady work ethic has won national cross-country and track championships and starred on the basketball court at Marianapolis Prep in Thompson, Connecticut.Two Fridays ago, the 17-year-old combined her track and basketball acumen with the same efficiency that […]