Each neuron is connected to other neurons—usually one thousand to ten thousand others. Just four neurons can be connected in sixty-three ways, or not at all, for a total of sixty-four possibilities. As the number of neurons increases, the number of possible connections grows exponentially (the formula for the way that n neurons can be connected to each other is 2(n*(n-1)/2)): For 2 neurons there are 2 possibilities for how they can be connected For 3 neurons there are 8 possibilities For 4 neurons there are 64 possibilities For 5 neurons there are 1,024 possibilities For 6 neurons there are
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