You have an empty wine bottle with a cork that has been secured at the top in a normal way. There is a metal ring inside the bottle that is suspended by a string.

How can you make the metal ring drop to the bottom if you are not allowed to touch anything - not the bottle, not the cork, not the thread and not the ring?

Can you fill the blank with the correct number?

6 30 870 756030 _____

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.
How?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

How can a man go eight days without sleep?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?