Looking to expand into Europe, lead gen and email marketer ClickSquared has bought UK online marketing services provider Rocket Science. Terms weren’t disclosed. Waltham, MA.-based ClickSquared says it had been searching for the right European complement for over a year. The company’s European base will operate from Rocket Science’s existing UK offices in Leeds and Middlesbrough. As part of the merger agreement, all of Rocket Science’s 27 staffers will report to Andrew Campbell, managing director ClickSquared Europe. Release (PDF)