SOLUTION RIDDLE 5:

To get to the solution of this great conundrum we must have in mind that a light bulb is heated, and the heat takes a while to dissipate when the light bulb goes off.

So, initially starting with three switches off, we can turn on the first switch for a few minutes. Then we turn it off, turn on the second switch and entered the room. If the bulb is on, then the second switch is that is connected to the bulb. If the room is turned off and the bulb is hot, the switch function will be the first switch . If the bulb is turned off and is not hot then the third switch is that switches the bulb.

  

What makes this particular conundrum, at least from my point of view, is that unlike others that the solution lies in pure logical reasoning or games hidden words in the title, presents us with a realistic situation, which we can implement and physically experience (preferably provided with a flashlight). In fact, it impels us to perform experiments with mind to finally reach a solution that is not a specific result, but an experimental method for information and discard possibilities by logical reasoning. 

When I heard for the first time this conundrum, more or less at age 8, I was caught between the switches and the room, which increasingly seemed darker; not come to solve it , I just gave up. However, hearing his explanation could almost feel mentally heat the bulb burning my fingertips, its light hitting in my eyes, and background logic of the problem, which seemed so palpable as the imagined bulb. It was an exciting experience and although there were countless subsequent experiences that led me to study physics, this was one of the earliest.