Nuance, the company that makes some of the voice recognition technology behind Apple's Siri, has adopted a 'poison pill' measure to deter any possible takeover attempts. Activist investor Carl Icahn, who recently bought more than $1 billion worth of Apple stock, also owns 16% of Nuance. Icahn is famous for putting pressure on companies that he invests in, and some believe he could press Apple to purchase Nuance. He has been publicly calling for Apple to
