The more of this there is, the less you see. What is it?

How can you leave a room with two legs and return with six legs?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

Can you spot the hidden girl in the picture below?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?