The answer is - Scissors
For some, I am used to get around. I never even touch the ground. Sometimes I fall in a large open tank and sometimes I float in the air and then rise. What am I?
Once you are in my sight, you are gone in a flash, and people tend to use me for cash. I am often used as a dire assist, and people often believe that I cause harm, when I am but its catalyst. What am I?
You have a piece of paper, 10cm by 10cm. Area = 100cm^2. For some reason, you need a square piece of paper with an area of 50cm^2. Using the paper you have, what's an easy way of getting the new square?