In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

What is black when you buy it, red when you use it, and gray when you throw it away?

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

Jessica is telling her friends this story and asks them to guess if it’s the truth or a lie: “There was a man sitting in a house at night that had no lights on at all. There was no lamp, no candle, and no other source of light. Yet, he sat in the house and read his book happily.” Her friends say she’s lying, but Jessica corrects them and says she’s telling the truth. Jessica’s story is true—but how?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Can you count the number of matches in the picture below ?

A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.