How is the moon similar to a dollar?

What do you answer even though it never asks you questions?

what does the below math rebus puzzle mean?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

Prove that twice of ten is the same as twice of eleven.

If an electric train is travelling south, then which way is the smoke going?