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A hammock-canoe drawing, U.S. Patent No. 299,951, is displayed in a June 1884 publication of the U.S. Patent and Trademark Office in Alexandria, Va. Critics of the patent system say it's too easy for people to save a slew of semi-realistic ideas, then sue when a firm separately tries to make something similar. Bloomberg via Getty Images hide caption

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Bloomberg via Getty Images

Some colleges and police departments are starting to use software that scans social media to identify local threats, but most tips still come from members of the public. Ikon Images/Getty Images hide caption

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Ikon Images/Getty Images

Awash In Social Media, Cops Still Need The Public To Detect Threats

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