9 surprising facts about flatulence

Everybody farts. But here are 9 surprising facts about flatulence you may not know.

Whether you try to hide it or not, you fart. Everybody does.

But even though it's such a routine activity — the average person farts between 10 and 20 times per day — there's a lot about farting that you might not know.
You produce about 500 to 1,500 milliliters of gas per day, and expel it in 10 to 20 farts

As part of research into the microbiome — the rich community of bacteria that live throughout your body — scientists have learned all sorts of interesting things about the bacteria that produce gas inside your intestines. Here are nine crucial things to know about flatulence.

99 percent of the gas you produce does not smell

One of the reasons we produce so much more gas than we realize is that nearly all of it is odorless.

Hydrogen, carbon dioxide, and methane make up as much as 99 percent of the gas produced in our large intestines by volume. (They're supplemented by air you swallow — more on that below.) All of these gases are odorless, which is why much of the time, farts don't actually smell at all.

http://www.vox.com/2014/12/4/7332411/fart-flatulence