Several readers have written with word of a new doorbell, invented by 13-year-old Laurence Rook. What's so special about a doorbell? This one lets you answer the door from wherever you can receive a call from its embedded 3G chip; to your in-person caller (facing the doorbell), that means it sounds like you're answering the door over an intercom system, even if you're really across town. Pretty clever way to make it harder for a thief to know if a home is actually occupied, though Rook says that he initially just wanted a system to avoid missed packages.
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