Nuance

If “staying active” is the key to a long life, Carl Icahn will probably live for years. At 77, the US investor is on a concerted activist campaign. He has tried (unsuccessfully) to disrupt Michael Dell’s buyout of the computer maker he founded, dined with Apple’s chief executive and pressed him to return cash to shareholders, and last week planted board members – including his son Brett – at Nuance, the Boston technology company that gives Apple’s Siri his/her voice.