lunes, 21 de febrero de 2011
Sunrise
domingo, 20 de febrero de 2011
viernes, 18 de febrero de 2011
Light
Inside a hermetically sealed room there is a light bulb, and outside the room there are three switches. Only one of the three lights the bulb. While the door is closed, you can press the switches as often as you want. But when you open the door, you have to say which of the 3 switches lights the bulb.
jueves, 17 de febrero de 2011
Don't be late!
You are in a room and you have the following materials: Two identical ropes and a lighter. You know that if you burn one of this ropes, it takes exactly one hour to burn completely.
You have to measure a period of 45 minutes, using only these items, How will you do it?
The ropes don’t have to burn at a uniform rate (half of the rope doesn't have to burn in half an hour necessarily)
You have to measure a period of 45 minutes, using only these items, How will you do it?
The ropes don’t have to burn at a uniform rate (half of the rope doesn't have to burn in half an hour necessarily)
miércoles, 16 de febrero de 2011
martes, 15 de febrero de 2011
Wich colour is the bear?
lunes, 14 de febrero de 2011
sábado, 12 de febrero de 2011
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