There's nothing like a fresh, tangy glass of orange juice to go with your morning oatmeal. But if you've just brushed your teeth, you may find that the beverage tastes … less than delicious. So, why does toothpaste affect the taste of orange juice and other sweet breakfast (or midnight) snacks? It all boils down to what's happening with the taste receptors on our taste buds, Guy Crosby, a nutrition professor at the Harvard T.H. Chan School of Public Health, told Live Science. In a nutshell, a compound in toothpaste called sodium lauryl sulfate (SLS) alters the way we process certain tastes, at least temporarily. [Why Do Some People Hate the Taste of Beer?] But let's start with how we detect different tastes. If you touch your tongue, you'll notice that it's covered with bumps and mini-ridges. Each of these bumps is made up of taste buds, which in turn are made up of taste receptors. Our mouthshave between 2,000 and 4,000 taste buds in total, and each taste … [Read more...] about Why Does OJ Taste Bad After You Brush Your Teeth?
Why does post nasal drip cause bad breath
Every day, the Earth spins once around its axis, making sunrises and sunsets a daily feature of life on the planet. It has done so since it formed 4.6 billion years ago, and it will continue to do so until the world ends — likely when the sun swells into a red giant star and swallows the planet. But why does it rotate at all? The Earth formed out of a disk of gas and dust that swirled around the newborn sun. In this spinning disk, bits of dust and rock stuck together to form the Earth, according to Space.com, a sister site of Live Science. As it grew, space rocks continued colliding with the nascent planet, exerting forces that sent it spinning, explained Smadar Naoz, an astrophysicist at the University of California, Los Angeles. Because all the debris in the early solar system was rotating around the sun in roughly the same direction, the collisions also spun the Earth — and most everything else in the solar system — in that direction. [Photo Timeline How the Earth … [Read more...] about Why Does the Earth Rotate?
Tech & Science Bad breath Food Hygiene Do you suffer from bad breath? If so, a pungent compound found in ginger could be the answer to your problems. The substance, known as 6-gingerol, stimulates an enzyme in saliva that can break down foul-smelling compounds, ensuring better breath—according to a study published in the Journal of Agricultural and Food Chemistry. For the research, scientists from the Technical University of Munich (TUM) and the Leibniz-Institute for Food Systems Biology analyzed the effects of certain food components on molecules dissolved in saliva. Many of these components, like 6-gingerol, contribute directly to the particular taste of foods and beverages. But they also indirectly influence our sense of taste in other ways via biological mechanisms that have largely not been identified—an area the researchers wanted to explore. Recommended Slideshows 67 The Best Pictures Ever Taken in Space 47 Underwater Photographer of the Year … [Read more...] about What Is 6-gingerol? It Might One Day Cure Bad Breath
Having a child changes a woman. It turns her into a mother … but also into a kind of chimera. This transformation doesn't result in a part-lion, part-goat fire-breathing monster of Greek mythology. But it does result in another type of chimera — one defined by the presence of cells in the body that come from at least two organisms. That's because the mother may live the rest of her life with cells in her body that are not her own, but her baby's. During pregnancy, some of the fetus's cells leave the womb, traveling through the placenta and into the mother's bloodstream, where they end up in various parts of her body. [Top 12 Warrior Moms in History] This phenomenon, later coined as "fetal microchimerism," was first discovered in the late 19th century by a German scientist named Georg Schmorl. A century later, interest in the phenomenon re-emerged, when scientists realized that fetal microchimerism could explain how Y chromosomes — only passed down from father to … [Read more...] about Why Does a Mother’s Body Keep Some of Her Baby’s Cells After Birth?
We've all experienced it. You walk into your kitchen or your office breakroom, and the smell assails you: savory, buttery, toasty. Someone's been microwaving popcorn. Yum — or ick, depending on your sensitivity. Google searches for the smell of microwave popcorn lead to threads that mention all kinds of odors, from buttery heaven to vomit to urine. (More accurately, it smells like a bearcat's butt, scientists say.) Love it or hate it, the smell of microwave popcorn is distinct. So, what's the chemical behind the aroma? In most cases, it's one of several artificial flavorings known for their oily, buttery vibe. These flavorings have occasionally appeared in the news, mentioned as health threats, but there isn't evidence that they hurt the casual popcorn-popper; they instead pose a danger, according to the National Institute for Occupational Safety and Health (NIOSH), to workers who inhale them in large quantities at facilities where microwave popcorn is made. [9 Snack Foods: … [Read more...] about Why Does Microwave Popcorn Smell So Bad?