What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

What does the below image rebus riddle means ?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

How many times in a given day, minutes and hour clock comes in a straight line ?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

What can go through glass without breaking it?

What does a man do only once in his lifetime, but women do once a year after they are 29?

Why is it very easy to weigh a fish?