Cristina was born in 1888. She just had her 30th birthday today how did that happen?

A Child was born in Lahore, Pakistan.

Still child is not a Pakistani citizen.why ?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

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

Why do we preferably have round manhole covers and not square ones?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

How can a man go eight days without sleep?

Can you find the key in the picture below?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?