LOL. That was from a joke about the
binary numeral system. The original joke says "There are 10 types of people. Those who understand binary and those who don't."
The decimal number 2 is written as "10" in binary. (And that's pronounced "one-zero", not "ten") So the joke actually says "There are 2 types of people", but the number 2 is written in binary. (Numbers in binary go like this: 1,
10, 11, 100, 101, 110, 111, 1000, 1001, 1010, 1011, 1100, 1101, 1110, 1111, 10000, 10001, etc. It's all zeros and ones.)
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