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When Matchstick badges communicate by infrared signal, they give attendees plenty to communicate about out loud. Guests program their badges by answering five multiple-choice questions. As people meet each other, their badge displays light up, showing a green light for each question they answered the same and a red light for each question answered differently. The five questions, customized by the event organizer, can range from the serious to the absurd, as long as each has three multiple

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