Why do farts smell so bad? A microbiologist explains the odors brewing in your gut
the gist
A healthy person passes gas about 14 to 20 times a day, enough in total to fill a party balloon. Farts are made of gases produced by trillions of microbes in the gut, mostly bacteria, that help digest food the stomach can't break down. Most of the gas has no smell. The stink comes from a tiny amount of sulfur-containing molecules, such as hydrogen sulfide, which is the rotten-egg smell. What you eat changes the mix: foods rich in sulfur compounds or fermentable fibers can make gas smellier, so the odor reflects your diet and gut health.
so what
Smell is a window into gut microbes, and the compounds that make gas stink in tiny amounts are the same ones the nose is extremely sensitive to.
fun fact
The human nose can detect hydrogen sulfide at extremely low concentrations.
The Conversation
Illustrative photo · Ikkei Shosai, Public domain, via Wikimedia Commons
In 1909 D. W. Griffith made a 14-minute film about a speculator who corners the wheat market and doubles the price of bread. A farmer sows his field while a 'Wheat King' gambles in the Chicago wheat pit; bakers raise the loaf from five cents to ten and the poor line up for bread. Griffith cut back and forth between the farm, the feast and the breadline, a technique called parallel editing, so audiences saw both ends of the economy at once. The film drew on Frank Norris's stories and on a real scheme: months earlier Chicago financier James Patten had cornered wheat, sent bread prices up and made about $5 million, roughly $185 million today.
how it works
To corner a market, a trader buys up most of the available supply and the futures contracts that promise more. Anyone who has to deliver the commodity must then buy from the cornerer at whatever price is demanded. The trader profits until the stock is released or the scheme collapses.
so what
A century on, it still shows how markets can be rigged by someone who controls supply, and how the people at either end, farmers and eaters, pay for it. It also helped establish editing as a way to argue a point, not just tell a story.
the bigger pattern
Corners have recurred whenever supply could be locked up, from the Hunt brothers' attempt on silver in 1979 to 1980 to the 'Black Friday' gold panic of 1869. Many such schemes end by collapsing, and the response is often new rules on speculation.
fun fact
In the film the Wheat King dies by falling into a grain elevator and being buried in the wheat he hoarded, an ending borrowed from Norris's novel The Octopus.
more on this
background
A Corner in Wheat is a 1909 American short silent film which tells of a greedy tycoon who tries to corner the market in wheat, destroying the lives of the people who can no longer afford to buy bread. It was directed by D. W. Griffith and adapted by Griffith and Frank E. Woods from a novel and a short story by Frank Norris, titled The Pit and "A Deal in Wheat". Griffith may have had a real-life inspiration: six months earlier, James A. Patten had actually cornered the market in wheat, and in some cities, the price of bread doubled from five cents to ten, just as in the movie.
In 1994, A Corner in Wheat was selected for preservation in the United States National Film Registry by the Library of Congress as being "culturally, historically, or aesthetically significant".
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