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?

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?

Why is the Hole below a Lock?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

The cream is heavier than Milk. True or False?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

What does this rebus riddle means ?

I know a nine-letter word having only one vowel.
Do you ?

Which word does the below Plexor means ?

I can write cow in 13 letters.

Can You?