The centre of the third figure is empty. What digit should fit inside?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

how come the second man dies?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

Can you find out the number that should replace the question mark with a valid reason?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

What has to be broken before you can use it?

How many words can a pen with half refill write?