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

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

What goes up but never comes down?

It is always ahead of me yet I can never see it. What is it?

What kind of band never plays music?

In a football game, Christina defeated Teresa by 2 - 0 but no man from either side scored. How can this be possible?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

What occurs twice in a week, once in a year but never in a day?

In order to complete the racing competition, the Mexico racetrack has to submit its top and the most famous three horses to win the competition. Due to an electrical storm, all the records are cleared and no one knows which horse holds the record. They all look identical and it becomes even more difficult to differentiate the horses. There are 25 horses in the Mexico racetrack. But there can be only five horses at a time on the track. What will the least number of races that can be conducted to find out the three fastest horses?

What's a single-digit number with no value?