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?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

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?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

What is the centre of gravity?

How many times can you subtract the number 5 from 25?

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