What do humans have in common with bike tires and those cartoon-character balloons that are hauled down parade routes on holidays? All three contain gas.
According to the National Institute of Health (NIH), it's common for people to produce one-half to two quarts of gas a day, expelling it in up to 14 daily bursts. Some gas gets into people's digestive tracts after they swallow it from the surrounding air. But some gas is there because bacteria in the colon produce it after munching on...


