What has 13 hearts but no other organs?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

A person is found murdered in his Chamber. When the crime scene is investigated, the Investigator find out that there is a calendar on which the victim has written a few numbers with his blood. The numbers are 4, 11, 11 and 4.

There are four suspects in the murder, John, Jacob, Anna and Lee. Can you find out who is the murderer?

Can you replace the question mark with the correct number?

What number when divided in half becomes zero?

What does below chemistry rebus means?

In the image below, can you find the value of an angle(y)

Can you decipher the two rows to find the hidden word?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

By using 'because' continuously three times, can you make an English statement ?