How many helium balloons would it take to lift a cat? That’s an odd question someone posed on Yahoo! If you study this problem scientifically, you can estimate the average weight of a cat, the lifting power of the average helium balloon, and then mathematically conclude the exact number of helium balloons you would need to lift a cat in the air.
Obviously this could be a dangerous experiment to try outdoors in case you use too many helium balloons and your cat goes drifting away. So for safety reasons, use a stuffed animal cat toy or another substitute for a real cat and then let your scientific mind go to work.