At first, I wasn't impressed. Oh, whoopee, this gizmo is going to buzz me when I walk out the door without my keys. Then the folks at Phone Halo happened to mention that if you keep going, it will go on to text you to tell you where you left your keys, post it on your facebook page, and twitter it out to all your friends. Finally, a good use of social media. (Of course, if you left them in a place you shouldn't have been in the first places—maybe not so good.)
Tekla S. Perry is a senior editor at IEEE Spectrum. Based in Palo Alto, Calif., she's been covering the people, companies, and technology that make Silicon Valley a special place for more than 40 years. An IEEE member, she holds a bachelor's degree in journalism from Michigan State University.