Quotes from Mary Roach

Humans have taste receptor cells in the gut, the voice box, the upper esophagus, but only the tongue's receptors report to the brain.

I would take delight in the optical non sequitur of a bear standing in front of a Louis Vuitton boutique. This poor goober with the burrata on its snout, innocent and utterly unaware of its likely fate, makes me want to cry.

even in death, men couldn't be trusted to comport themselves respectably in the presence of a lady.

How is it that we find Christina Aguilera more interesting than the inside of our own bodies? It is, of course, possible that I seem strange. You may be thinking, Wow, that Mary Roach has her head up her ass. To which I say: Only briefly, and with the utmost respect.

Which is something to be thankful for," says Danielle Reed, Rawson's former colleague at Monell. Otherwise you'd be tasting things like bile and pancreatic enzymes. (Intestinal taste receptors are thought to trigger hormonal responses to molecules, such as salt and sugar, and defensive reactions—vomiting, diarrhea—to dangerous bitter items.)

Now she's coming out one of the nostrils, across the septum, and then she's going to reenter the mouth. There are a variety of ways of closing the mouth," he adds, and then he begins talking about something called a needle injector. I pose my own mouth to resemble the mouth of someone who is quietly horrified, and this works quite well to close Theo's mouth. The suturing proceeds in silence. Theo

As the number of Inuit who hunt has dwindled, so has the consumption of organs (and other anatomy not available for purchase at the Igloolik Co-op: tendons, blubber, blood, head). I picked up the card labeled Caribou Kidney, Raw. "Who actually eats this?" "I do," said Nirlungayuk.

Men and women . . . do not ingest nutrients, they consume food. More than that, they . . . eat meals. Although to the single-minded biochemist or physiologist, this aspect of human behavior may appear to be irrelevant or even frivolous, it is nevertheless a deeply ingrained part of the human situation." The

Twenty-five percent of the nurses in one study, writes Larson, had dry, damaged skin. Ironically, the nurses may be exacerbating the very thing that hand-washing seeks to prevent: the spread of infectious bacteria. Larson says healthy skin sheds 10 million particles a day, and 10 percent of those harbor bacteria. Dry, damaged skin flakes off more readily than healthy, lubricated skin and thus disperses more bacteria. Damaged skin also harbors more pathogens than healthy skin. As

Not long ago, a whale biologist named Phillip Clapham sent me a photograph that illustrates the consequences of life without a doorman. Like most creatures that swallow their food whole, sperm whales have a limited-to-nonexistent sense of taste. The photo is a black-and-white still life of twenty-five objects recovered from sperm whale stomachs. It's like Jonah set up housekeeping: a pitcher, a cup, a tube of toothpaste, a strainer, a wastebasket, a shoe, a decorative figurine.

Yes, men and women eat meals. But they also ingest nutrients. They grind and sculpt them into a moistened bolus that is delivered, via a stadium wave of sequential contractions, into a self-kneading sack of hydrochloric acid and then dumped into a tubular leach field, where it is converted into the most powerful taboo in human history. Lunch is an opening act. M

Vinegar, cola, citrus juice, wine, all are in the acid range of the pH scale: from around pH 2 to 3. Anything under pH 4 will dissolve calcium phosphate, a key component of tooth enamel. The process is called demineralization. Take a drink of anything acid, and if you are paying attention, you will notice a sudden warm slosh: parotid saliva arriving like the cavalry to bring the pH back up to the safe zone.

Time to try the palatant. I raise the cup to my nose. It has no smell. I roll some over my tongue. All five kinds of taste receptors stand idle. It tastes like water spiked with strange. Not bad, just other. Not food.

Sugar contributes to tooth decay only indirectly. Like humans, bacteria are fond of it. "Bacteria get all crazy—party, party—they metabolize the sugar, break it down, and they release their metabolites, and these are acid" (though not as acid as cola or wine). In

sugar itself doesn't cause cavities; it's the acidic metabolites of the bacteria that feed on the sugar. As with acidic foods, saliva dilutes the acid and brings the mouth back to a neutral pH. You

It's like a cat trying to imagine the taste of sugar. Cats, unlike dogs and other omnivores, can't taste sweetness.

Could thorough chewing lower the national debt? If saliva is full of bacteria, why do animals lick their wounds? Why don't suicide bombers smuggle bombs in their rectums? Why don't stomachs digest themselves? Why is crunchy food so appealing? Can constipation kill you? Did it kill Elvis? You

And of a superior quality—as demonstrated by an unnamed "literary test subject" who, in July 1903, while living in a hotel in Washington, D.C., subsisted on a glass of milk and four Fletcherized corn muffins a day. It was a maximally efficient scenario. At the end of eight days, he had produced sixty-four thousand words, and just one BM.

Space Shuttle toilets have always been mounted on the floor, but you would not call them normal. The original shuttle toilet bowl featured a set of 1,200 rpm Waring blender blades positioned a brief 6 inches below the sitter's anatomy. The macerator would pulp the feces and tissue—meaning, if all went well, the paper, not the scrotal, variety—and fling it to the sides of a holding tank.

The caption uses the scientific term for lip-licking: "lateral tongue protrusion.")

tried to reenliven mealtimes by hiring a quartette to sing "The Chewing Song,"† an original Kellogg composition

Flavor is a combination of taste (sensory input from the surface of the tongue) and smell, but mostly it's the latter. Humans perceive five tastes—sweet, bitter, salty, sour, and umami (brothy)—and an almost infinite number of smells. Eighty to ninety percent of the sensory experience of eating is olfaction.

Seriously hairy shit was going down on a regular basis.

Humans are better equipped for sight than for smell. We process visual input ten times faster than olfactory.