Yes. Diaconis, Holmes, and Montgomery demonstrate (but do not provide a full specification for) a coin-flipping machine which will yield heads 100%* of the tim

Yes. Diaconis, Holmes, and Montgomery demonstrate (but do not provide a full specification for) a coin-flipping machine which will yield heads 100%* of the time (as long as it starts on heads). "Dynamical bias in the coin toss". https://statweb.stanford.edu/~susan/papers/headswithJ.pdf https://statweb.stanford.edu/~susan/papers/headswithJ.pdf * Or at least every time the experiment is performed.