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>They also had to invent a new type of gate – one that switches based on the sum of the number of its input that are at logic 1.

What? Isn't that just AND? I wasn't really too clever from looking at the diagram provided, so I might be missing something.

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Looking at the waveform graph on the site, it looks like it turns the output to 1 when both inputs are 1, and turns the output to 0 when both inputs are 0 (In other words, it assigns the output to the inputs when the inputs are in agreement). Though, that's just a guess.

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