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...table salt dissolved in it as possible - what's called a 'saturated' solution). The paper discs need to be the same size as the 10p coins so that they don't overlap and short-circuit. Build up your pile by placing a 2p coin, a 10p coin and then a disc of wet paper towel in sequence. The lemon juice (or salt solution) is there to act as a conductor, to help the electrons...

...de Condorcet and Jean-Charles de Borda. (Condorcet was friends with Thomas Jefferson, who appears to have paid little attention to Condorcet’s writings about voting.) Condorcet suggested that, if an absolute majority – more than half the voters – prefers Candidate X to Candidate Y, then Candidate Y should not be the winner. That seems very reasonable. Why not make...

...tables, so that you can compare them with the non-classical output of the quantum versions of these gates described in Section 5...Introduction to quantum computing: 4.1 Classical bits and logic gates - In classical computing, the smallest piece of information is called a bit. A bit may take only one of two logical values: either 0 or 1. Strings of bits are used to...