How could a baby fall out of a twenty-story building onto the ground and live?

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

Identify the 10 differences between the two given pictures.

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?

Using Only Five 5's and any mathematical operator make sum as 37

On rolling two dices (six-sided normal dice) together, what is the probability that the first one comes up with a 2 and the second one comes up with a 5?

What time is it when an elephant sits on a fence?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?