Question: You were asked to label the light switches for your company. You are in a room, with unlabeled light switches. There are 3 of them, and there are 3 lightbulbs in the next room. You can not travel back and forth. How do you successfully label the lightbulbs???
Answer: You turn on the first 2 switches, and wait for 5 minutes. Turn off the second switch. Go into the next room. The light that is on is the first switch, the light that is warm is the 2nd switch, and the light that is off and cold is the 3rd.