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Thinking Critically

Answer to puzzle number 34

There are two rooms - one room with three light bulbs, the other with three light switches. Each switch turns on one light. If you can only travel to each room once, how can you tell which switch controls which light?

First -- Turn on one for a long time, then turn it off and turn on a second one. Run to the next room. The one that's off and warm is the first, the one that's on is the second, and the last is the one that is cold.

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