What has 13 hearts but no other organs?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

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

In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Which fur should we be getting from the Lion?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

A man embarked on a questionnaire game. He kept asking the same question to whomever he found. The answer each time was different.

Can you guess what the question was?