There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

When it is alive we sing, when it is dead we clap our hands. What is it?

How can a man go eight days without sleep?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

You can win me and lose me but never buy me
You can not eat me and never want to part with me
I can make you cry or bring you joy
I am not a machine and definitely not a toy
You keep me but i am not forever just yours
You might find me in a case or on a shelf next to a vase
I am hard and i am tall if you bump me i am sure to fall
I am made of different materials and am at many events
If your lucky and fight hard I might be yours
What am I ?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

Look at the picture and find out which square is not linked with any of the other squares.

Can you make a fire with just a single stick?

Why is a river so rich ?