What has 13 hearts but no other organs?

What can you see in the middle of March and April that you can never see in any other month?

On a bus, there is a 26-year-old pregnant lady.
A 30-year-old policeman.
A 52-year-old random woman.
And the 65-year-old driver.

Who is the youngest?

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

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

What does this rebus riddle means ?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

On a special event at the prison, 5 prisoners John, Jacob, Krist, Tang, and Dang given a chance to go to a sauna and can bring one thing with them.

Following are the things that the prisoners bring with them.
John: A soda
Jacob: Thermos
Krist: Book named "How to kill"
Tang: A Walkman
Dang: Harmonica

Since it is a Sauna, no one can see each other. After a while When the steam is switched, Tang was found dead and there was blood all around.
J Bond was called and he instantly come to know who can be the murderer. How?