Why do you find that most of the buildings are deprived of the 13th floor?

What number when divided in half becomes zero?

What kind of band never plays music?

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?

When is the top of a mountain similar to a savings account?

What begins with T, ends with T, and has T in it?

What has a bottom at the top?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

What has many teeth, but cannot bite?