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.
Electronic voting. Yea, even internet voting. Really shouldn't be impossible. Tom Scott says this is a terrible idea, but I don't think it's so unsolvable. The ways to cheat are: - stuffing the ballot box with bogus votes - counting or recording the votes bogusly - voting more than once or voting for someone else Voter confidentiality must be preserved. Here's my solution. - every voter must authenticate with some non-government system that 1) ensures user ID uniqueness 2) contains a method for contacting the voter (can be a form obscuring contact details) 3) creates a random code which is not retained by the system. This is easily done by Google, Facebook, or any tiny NGO. They would need to register and be subject to audit. - when a user votes, the data is logged in two public registers. 1) a voters register showing the person's user ID (or a unique variant from the authenticator) 2) a vote register showing the random code and how they voted
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