Splenic-flexure syndrome is a chronic disorder that may be caused by gas trapped at bends (flexures) in the colon. Crohn's disease, colon cancer, or any disease that causes intestinal obstruction, may also cause abdominal bloating. Internal hernias or adhesions (scar tissue) from surgery may cause bloating or pain.
For many years it was thought that the maximum number of folds that could be achieved was just seven! This was the case until when in 2002 American teenager Britney Gallivan demonstrated that a sheet of paper can be folded 12 times, provided that it is long enough and thin enough.
Another advantage of medium weight papers like letter paper and stationery is that any creases you make will stay secure. This is especially important if you want your airplane to fly far and fast, as sloppy, loose folds make the plane less aerodynamic. As a rule, the smoother the paper, the better it will take a fold. Avoid pulpy papers and those with large grains that get mushy when creased.