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

What does this mathematical rebus means ?

I travel all around the world but always stay in the corner. What am I?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

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

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

Look at me. I can bring a smile to your face, A tear to your eye, Or even a thought to your mind. But, I can't be seen. What am I?

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

Which tank will fill first?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?