Who are the happiest people in IPL match?

Rearrange the letters in "new door" to make one word.

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

Prove that the below maths equation is true.

8 + 8 = 91

Why are all black people so quick ?

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

What is the coolest letter in the alphabet?

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?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?