For thousands of years, shipworms — a family of mollusks found in oceans — sank wooden vessels, ravaged wharfs and shipwrecked sailors. They even devastated the Spanish Armada in the 16th century. Exactly how they have been able to wreak such havoc has remained a mystery, until now.  A new study published in the journal read more New study uncovers how shipworms plagued seafarers for millennia