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).
During inflation the balloon is filled with cold air using a fan. The balloon fabric is just a giant sail, and winds approaching 10 mph make it almost impossible to fill the balloon. The wind will cave the side of the balloon in and the resulting sail effect places tremendous loads on both the fabric and the basket.