Question: There are three doors: First door~ all kinds of snake will strike you once you've entered this door. Second door~ about thousands of skillful assassins are waiting in this door. Once you've entered, they will attack you to death until there are no bones left. 3rd door~ a desert, you will be die any minutes. Because there's no water (exhaustion) and from extreme the heat of the sun. Which door would you choose? Which door you think that is safe to enter???
Answer: 3rd Door; you will only have to wait until night. So that the temperature from the desert will decrease as it gets colder during the night in the desert.
Question: You have a glass of water that looks about half full. How can you tell, only using the glass of water itself, if the glass is half full or not?
The glass is a right cylinder.
Answer: Tip the glass of water until the water reaches the rim of the glass and if the water lines up perfectly with the bottom rim of the glass, it is half full.