<div><div class="yn-story-content">
                <p>LOS ANGELES – There was no stopping "Limitless" at the box office.</p>
                <p>The sci-fi thriller opened at No. 1 this weekend with $19 million, according to studio estimates Sunday.</p>
                <p>The film from Relativity Media stars Bradley Cooper as a struggling writer who takes a magical pill that allows him to tap into his maximum brain potential. Suddenly he's cleaned up, making millions and wowing everyone he meets.</p>
                <p>Robert De Niro co-stars as a financial guru who's fascinated by him, with Abbie Cornish as Cooper's skeptical girlfriend.</p>
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            </p></div></div><p><strong>Read more:</strong> <a class="rssreadon" rel="external" title="`Limitless' tops box office with $19M   (AP)" href="http://us.rd.yahoo.com/dailynews/rss/entertainment/*http%3A//news.yahoo.com/s/ap/20110320/ap_on_en_mo/us_box_office" target="_blank">http://us.rd.yahoo.com/dailynews/rss/entertainment/*http%3A//news.yahoo.com/s/ap/20110320/ap_on_en_mo/us_box_office</a></p>