What runs around the whole yard without moving?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

How many letters are in the alphabet?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

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

There were five men at church, and it started raining while they were outside. The four that ran still got wet, but the one that was still stayed completely dry. Why did he stay dry?

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

In the picture given below, can you find out which digit will take place of the question mark?

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 do you answer even though it never asks you questions?