How can a man go eight days without sleep?

Three playing cards in a row. Can you name them with these clues? There is a two to the right of a king. A diamond will be found to the left of a spade. An ace is to the left of a heart. A heart is to the left of a spade. Now, identify all three cards.

What can you see in the middle of March and April that you can never see in any other month?

John is now two fifth of his older brother's age and two years from now he will be half of his older brother's age.
Two years ago, John was only one-fourth the age of his older brother age at that time.

How old is John now?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

Can you find the least possible number such that

If the number is divided by 3, it gives the remainder of 1;
If the number is divided by 4, it gives the remainder of 2;
If the number is divided by 5, it gives the remainder of 3;
If the number is divided by 6, it gives the remainder of 4.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

People put me on the table and cut me but do not eat me. What am I?

Give it food and it will live; give it water and it will die.