You can. And now that Google has launched its Google Voice service (google.com/voice), it’s free. At press time, the service was invitation-only, but when it becomes more widely available, here’s how it will work: You get a new universal phone number with your choice of area code, along with a Web-based inbox to manage your voicemail, text messages and call history. From there, you set up calling rules and filters, allowing you to designate that calls from your spouse, for example, ring on all your numbers at once but that when your chatty cousin calls, only your cell rings or it goes straight to voicemail. You can also listen in as the caller leaves a voicemail or have messages transcribed and sent by e-mail or text, so you can get the gist of the call you just ducked.While you’re at it, take advantage of other Google Voice services, like live call recording and free Web-based text messaging. It also supports Gizmo (gizmoproject.com), a Skype-like service that lets you make and receive calls from your computer for free using your Google Voice number. And if you’re a cell jockey, note that Google now has apps that integrate the service into your BlackBerry or Android phone’s dialing, address book and SMS functions.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.