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

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

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

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

What always comes into a house through the keyhole?

what's the probability of getting a king or a queen from a pack of 52 cards?

Spot what is wrong here in below Picture?

I taste better than I can smell. Who am I?