Hey, smart people, I know what you're thinking. This is clickbait. I used to respect you, Joe. Now you're just making（使） fart videos? Well, I can assure（使确信） you this is not clickbait, but this is a fart video. A science fart video?

  No hot air. Well, maybe a little. Everybody farts. You, your mother, kittens, the dolly llama, probably regular llamas, too. Just about anything in the animal kingdom（王国） with a rear（后方的） end can and does fart. And passing gas can have a lot of different purposes.

  Herring（鲱）, they fart to communicate. Coral snakes fart as a defense mechanism（机制）. The West Indian manatee uses farting to regulate（管制） its buoyancy. And beaded lace（饰带） wings make（使） death farts. And gas that specifically evolved（发展） to paralyze（瘫痪） and ultimately（最后） kill termites. Who also fart.

  A lot. Like, termites（[昆]白蚁） fart enough to contribute（捐献） maybe a few percent to global greenhouse（温室） gas emissions. That's a lot of gas. Flatulence is a natural, common thing. It's typically caused by either trapped（诱骗）, swallowed（ 吞下） air or gas produced as a byproduct from friendly microbes（微生物）, digesting food in your gut（内脏）. When complex carbohydrates（[有化] 碳水化合物） make（使） it to your colon（[解剖] 结肠）, they're broken down by a rich ecosystem.

  Billions of microbes passing digested bits between one another and creating gases in the process. Your farts are really just billions of tiny microbial（微生物的） toots. Humans typically squeeze（压） out about 10 to 20 farts every day. Each around the volume（卷） of a golf ball, totaling（总数达） about a liter of gas daily. All of our combined butt（屁股） babble（含糊不清的话） adds up to about 7 billion liters of human gas released every day. The compounds（[化学] 化合物） that make（使） farts stink（发出臭味） make（使） up less than 1% of the volume（卷）.

  About a quarter is comprised（包含） of gases like oxygen and nitrogen（[化学] 氮）.