Kidneys are a filter system. The main job of the kidneys is to remove waste from the blood and return the cleaned blood back to the body. Each minute about one litre of blood ï­ one-fifth of all the blood pumped by the heart - enters the kidneys through the renal arteries.
The volume of helium in the balloon has been estimated as being able to lift a total load, including the balloon material and the structure beneath it, of 65 pounds (29 kg) at sea level and 48 pounds (22 kg) at 8,000 feet (2,400 m).
Our 265 million liters of air fit in a cube with sides of about 64.2 meters long. It also fits is a sphere with a radius of 39.85 meters. So if we spend our lifetime filling up a balloon, it will have a diameter of almost 80 meter by the time we breathe our last breath.