A light-tight wooden box has three switches on the outside that control three light bulbs on the inside. When the box is closed you can turn the switches on or off but when you open the box how can you tell which switch controls each bulb without touching the switches?

Answer: Turn one switch on for five minutes, then turn it off and turn on another switch before you open the box. One bulb will be lit, one will be warm, and the unswitched one cool!

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