I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?

Why is Saturday stronger than Monday?

There is a straight highway. Four different villages lie on that highway. The distance between them is different. The third village is 60km away from the first village; the fourth is 40 km away from the second; the third is 10 km near to the fourth that it is to the second.

Can you calculate the distance between the fourth and the first village ?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

Why do we preferably have round manhole covers and not square ones?

The more you take me, the more you leave me behind.
Who Am I?

Before Mount Everest was discovered, what was the highest mountain in the world?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?