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@SteveBellovin @mattblaze
If you want me to talk and never shut up, ask me about how a piano works! (The problem: finger pressure powers a hammer so it strikes strings, but the hammer must be free-pivoting (not coupled to finger) at the moment of the strike, and must then stop on the recoil without bouncing and not strike again until the finger releases from the key, at which point the hammer must be ready to strike again ASAP. No electricity allowed.)