Surely this already exists and a bit of research would turn up whether it serves this exact need or not or if it needs to be adapted. But how about if a school puts in little scanner thingies on every classroom doorway and then requires each child to wear a badge or something. If a child hasn't come through the door at the specified time a text is instantly sent to the parent. Although this may be handy for all kids (teens will game the system of course) I'm thinking more for primary school-aged kids. This would prevent the dreaded situation of a child being forgotten in the car in the parent's work parking lot or left sleeping on the bus.
Have you ever been in a speech or something where the speaker fields questions from the audience? If you weren't in a UN-style microphone-at-every-seat equipped room, then you probably saw one or two saps running the microphone around to those asking questions. I was this sap recently in a press conference, and although I consider myself quite agile, it still delayed things and was noisy for the cameras (not to mention my beautimous profile when I had to run in front of them). I've also heard people bragging about shot-gun mics that can pick up someone's voice leagues away. Couldn't these work in this situation, where the sap can just stand at the front with headphones on and point the mic at whoever is talking? Maybe it wouldn't work so well in a football stadium, but surely a 20-person press conference could manage. Right?
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