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

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

A Car driver was heading down a street in Washington. He went right past a stop sign without stopping, he turned left where there was a 'no left turn' sign and he went the wrong way on a one-way street. Then he went on the right side of the road past a cop car. Still, he didn't break any traffic laws. Why not?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

1. Where does Easter come from before Valentine's Day?

2. Do you know what is in the middle of Valentine's?

3. What did the lady bee say to the man bee on the occasion of Valentine's Day

Which country gets ill every time?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

What brings you down but never up?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?