This is a bathtub that has the hot water circulate around a ceramic channel that's built into the tub (on the outside, but hidden) before spewing the water into the tub. That way your tub warms up as soon as you turn on the water.
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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