13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

Solve the rebus riddle in the picture below.

How can you leave a room with two legs and return with six legs?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

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

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

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

Why is the Hole below a Lock?

When 99 is considered higher than 100?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?