[null and void]

It’s the punchline to a very long old story.

It starts with a guy who develops an orange flavored feminine hygiene spray...

[loungitude]

Both Alice and Bob randomly choose which resistor to use. A quarter of the time they will both choose the high resistor, producing a lot of noise on the line, while a quarter of the time they will both choose the low resistor, producing little noise. If either detect a high or a low amount of noise in the line, they ignore any communication.

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Bob and Alice each have two cans of spray....