How many sides does a circle have?

Before Mount Everest was discovered, what was the highest mountain in the world?

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

One night, a woman receives a call from the police. They tell her that her husband was murdered and that she should come to the crime scene as soon as possible. The woman drops the phone, shocked, and drives 20 minutes to the crime scene. As soon as she reaches the crime scene, the police arrest her and she is convicted of murder. How do the police know she committed the crime?

what's the probability of getting a king or a queen from a pack of 52 cards?

Decode below rebus
D
N
A
T
S , D

What is the riddle which can be asked all day with a different correct answer each time.

Two fathers and two sons went fishing one day. They were there the whole day and only caught 3 fish. One father said, that is enough for all of us, we will have one each. How can this be possible?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

What happened when the wheel was invented?