By now, even your toddler knows where and how to locate just about anything on the Web. But unless your friends are all dialed in to the same social network, a white-pages-style directory for finding actual people is often harder to come by. These five services aim to change that.
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In our December issue, Popular Science names the 100 best innovations of the year: bombproof wallpaper, self-parking cars, the fastest helicopter, and 97 more. Plus inventor profiles and videos.
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