Body Heat Lost Through Head
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A US Army Survival Manual started this myth. Find out if you lose heat through your head in this video.
Transcript: If this were true, you could walk around in the cold in just a hat and no pants. But that would almost...
If this were true, you could walk around in the cold in just a hat and no pants. But that would almost certainly leave you much, much colder than going without a hat. And in much greater danger of being fined for public indecency. But it's simply not true. Body heat leaves from any skin surface in proportion to the area exposed. So where does this myth come from? This oft-quoted maxim goes back to a 1970 US Army Survival Manual, which strongly recommended covering the head in cold weather, since "40 - 45 % of body heat" is lost from the head." Head heat loss is usually less than 20-30 % of total heat loss, and changes with how cold it is. The lower the temperature, the higher percentage head heat loss. Hardly a majority. And as for people who claim a hat renders shorts acceptable in cold weather? Let's just say, "questionable fashion sense!"More »
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How clean is your dog's mouth? Cleaner than yours? Find out what kind and how many germs are finding their way to your dog's mouth.
Transcript: Here is the myth that makes dogs sound like a dental miracle: despite all the leftover tuna sandwiches,...
Here is the myth that makes dogs sound like a dental miracle: despite all the leftover tuna sandwiches, coffee-ground strewn garbage and rancid chicken bones they chew, our canine friends STILL maintain better oral hygiene than humans do, despite how carefully we floss and brush our teeth. Could this really be true? In a word, NO. The myth that a dog's mouth is clean most likely stems from their practice of licking their wounds. What that tongue is actually doing is ridding the wound of dead tissue. A dog's mouth is besieged by its own legions of germs, roughly as huge in population as those living in the human mouth. And, as we all know, dogs aren't particularly fussy about where they put their tongues. "A dog's mouth contains a lot of bacteria," confirms veterinarian Dr. Gary "Ask the Vet" Clemons. "Remember, a dog's tongue is not only his wash cloth but also his toilet paper."More »
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How much of your brain do you use? Probably more than you think. Check out this video to find out more about whether you use only 10% of your brain.
Transcript: People have believed that we use only 10% of our brains for more than 100 years. Unfortunately, all that...
People have believed that we use only 10% of our brains for more than 100 years. Unfortunately, all that means is that people have been wrong for MORE than 100 years. This is probably one of the most oft-repeated factoids about the brain, in part because it's been endlessly publicized in the media. Here's the thing, though; it's NOT true. Brain scans show that the vast majority of the brain does NOT lie fallow. For any given activity, like eating, walking, kissing, or reading naughty novels, you use a few specific parts of your brain. So where did the myth come from? Many sources point to an American psychologist from the early1900s, named William James, who said: "the average person rarely achieves but a small portion of his or her potential. "Many sources point to an American psychologist from the early1900s, named William James, who said: "the average person rarely achieves but a small portion of his or her potential." Over the course of a whole day, however, just about ALL of the brain is used at one time or another. You are, in fact, using 100% of your brain.More »
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Do fingernails and hair grow after death? Watch this video to find out the truth behind this gruesome idea.
Transcript: Should we include with our organ-donor cards, haircut and manicure instructions to the mortician? Factoids...
Should we include with our organ-donor cards, haircut and manicure instructions to the mortician? Factoids with creep factor are ALWAYS fun to repeat, especially around a campfire, but this often repeated statement is NOT what it seems. In the body, after death, the tissue around the hair shafts and nail folds dries out and shrinks away, giving the IMPRESSION of growth. This process is otherwise known as dehydration. This retraction of the skin around the hair and nails makes nails and hair look longer. But basically, it's an optical illusion. Dead is dead. The only things growing after you're dead are worms, bacteria, and flowers-if your family was fond of you. Actual hair and nail growth requires a complex set of regulated hormones to occur. This is good news; active endocrine systems postmortem would be even creepier than this non-factual "factoid"!More »
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Does shaving make hair grow thicker? Or is it something that has travelled down generations that no one bothered questioning? Check out our video to find out the truth.
Transcript: Lie! Stubble only APPEARS thicker until it grows out a little, then tapers a bit. After you shave body...
Lie! Stubble only APPEARS thicker until it grows out a little, then tapers a bit. After you shave body hair, it may feel coarse or "stubbly" for a time as it grows out. And during this phase, it may be more noticeable - and may appear darker or thicker. When hair first comes in after being shaved, it grows in with a blunt edge on top. Hair naturally tapers at the end, and when you shave it, you're cutting it flat, so as it re-grows, it seems thicker and more coarse. But it's not. And as the hair gets longer again, it will feel softer. Hair that's just emerging can be darker too, since it hasn''t been bleached by the sun and other chemicals. Those little sprouts are just your natural color, nothing darker. And don't you think that if this myth WERE true, that bald men would be shaving their burgeoning bald spots in order to stave off the Yul Brenner look?More »
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Can stretching before exercise prevent injury? This is a frequently asked question by most people who exercise regularly. Get your answer by watching this video.
Transcript: Back in grade school you were probably taught the importance of warm-up exercises, and it's likely you've...
Back in grade school you were probably taught the importance of warm-up exercises, and it's likely you've continued with pretty much the same routine ever since. Science, however, has since moved on. Researchers now believe that some of the more entrenched elements of many athletes' warm-up regimens are not only a waste of time, but are actually bad for you. The old presumption that holding a stretch for 20 to 30 seconds-known as static stretching-primes muscles for a workout is dead wrong. Recent research has found that it ACTUALLY weakens them, which can increase your chances of becoming injured, and can also lower your workout performance, according to a recent University of Nevada study. Other studies have found that this pre-workout stretching decreases muscle strength by as much as 30%. The best way to PREPARE your body for physical activity? With a 3 to 5 minute warm-up of brisk walking, light jogging or cycling.More »
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Cosmetic companies would love for us to believe that if we don't wash our face using their products, that acne will soon plague us. Could they be right, though?
Transcript: Once upon a time, people thought acne indicated a lack of hygiene. Then word spread that frequent face...
Once upon a time, people thought acne indicated a lack of hygiene. Then word spread that frequent face washing could actually aggravate acne and that hygiene had little to do with it. Acne is caused by the effects that hormones have on your sebaceous glands. This is the reason teenagers often have issues with acne. Stress plays a role too, since it pushes hormonal buttons. Surface dirt really won't cause acne breakouts, but improper face washing can and will aggravate an existing acne condition. Too much washing of your face can ACTUALLY cause you to get MORE acne, as the body compensates to replace the body oil washed away. Now, we're not saying NOT to wash your face, in fact, research has shown that washing morning and night, with a gentle non-comedogenic cleanser like Cetaphil, is a good way to keep skin in great shape.More »
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If you wait after eating to go swimming, are you less likely to drown. Probably not. Check out this video to find out why.
Transcript: No one has ever drowned because they went swimming with a full tummy. While it MIGHT make you uncomfortable,...
No one has ever drowned because they went swimming with a full tummy. While it MIGHT make you uncomfortable, it WON'T cause you to drown. While there's theoretical cause for concern, since the body diverts circulation of blood to the gut-and away from the muscles-which COULD cause a cramp, it's not a real threat. And even if you did get a cramp, in most cases, you could easily exit the water before any real damage is done. alcohol use, lack of safety gear on boats, and lack of protective fencing and covers for pools. Taking some time to digest makes sense, but FAILING to do so is NOT the enormous danger about which we're often warned. However, ALWAYS listen to signals from YOUR body-if you experience pain, severe fatigue or cramping when swimming, go park yourself on your towel, and wait till you feel better, before jumping back in.More »
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If you've recently stopped working out regulary, you might worry that your muscle can turn to fat. But is this true? Find out the truth in this video.
Transcript: Maybe this myth was started by the marketing department of a health club chain. People often worry that...
Maybe this myth was started by the marketing department of a health club chain. People often worry that once they stop regularly working out, their muscle will become fat. But muscle CANNOT turn into fat, because they're made of two very different types of cells. People get fat when they stop working out, because they continue to eat the same amount of food, but burn off fewer calories. As a result, their unused muscles grow soft while they simultaneously gain excess body fat. If you stop exercising, you'll still have the same NUMBER of muscle cells-but each will get thinner. If you continue to eat the same amount of food, *the fat cells, which were already there, will expand. This is the basic weight gain equation: if your "calories in" are greater than your "calories out," then your fat cells will begin to bloat and gloat. But under no circumstances will your muscle cells morph to fat cells.More »
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Having healthy levels of Vitamin D is vital to your overall health. But is spending time outdoors the best ways to absorb vitamin D? Check out this video for more information on Vitamin D and the outdoors.
Transcript: Vitamin D, often referred to as the 'sunshine" vitamin-since sunlight is the best source-is key to sustaining...
Vitamin D, often referred to as the 'sunshine" vitamin-since sunlight is the best source-is key to sustaining long-term health. Prevailing wisdom has been that we get sufficient amounts of Vitamin D from our everyday exposure to sun, but recent research has found that this is NOT the case. Basically, your body cannot make Vitamin D, but you CAN get it from food and sunlight. Unfortunately, you cannot rely on diet alone to supply enough vitamin D. Exposure to sunlight is the key to producing ample amounts of this essential vitamin. But don't take this as license to bake yourself to a crisp in the sun. Generally, your body will produce adequate amounts of vitamin D with 20-30 minutes of sun exposure on your hands, arms and face everyday-but here's the rub, sunscreen dramatically inhibits UV ray penetration, which is necessary for Vitamin D production, so go out with some of your skin sunscreen-free, and then apply after 20-30 minutes have passed.More »
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Does reading in dim light ruin your eyesight? Click on this video to find out.
Transcript: This is one myth that parents around the world have been bandying about for ages; yet, it has scant scientific...
This is one myth that parents around the world have been bandying about for ages; yet, it has scant scientific backing. Reading in the dark CAN cause temporary eye strain, headaches, and tired eyes, but these pesky issues quickly go away once one returns to bright light. Just think: our ancestors lived in much dimmer circumstances, often reading by candlelight, and they weren't blind due to their electrical handicap. By comparison, we are living in the best-lit conditions ever. And myopia-or nearsightedness-has been incorrectly blamed on the practice of reading in dim lighting. Genes are at fault here, not the wattage of your light bulbs. You might make your eyes tired by reading in the dark, or give yourself an eyestrain headache, but the only thing you might RUIN by reading in dim light, is your ability to FINISH what your reading.More »
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You've heard it since you were a kid that eating carrots improves your eyesight. is this fact or fiction? Find out more by watching this video.
Transcript: Though carrots contain a high concentration of beta-carotene, a form of vitamin A, essential for healthy...
Though carrots contain a high concentration of beta-carotene, a form of vitamin A, essential for healthy eyesight, an extra helping of carrots on your plate won't give 20/20 vision. Vitamin A deficiency can ACTUALLY cause blindness, so if you START OFF with a vitamin A deficiency, then eating more carrots will, of course, help improve your vision. The genesis of the sight-improving attributes of this modest root vegetable is generally attributed to a campaign of misinformation carried out by the British Government during WW II. British intelligence didn't want the Germans to know that they were using radar to detect bombing raids, so they spread the rumor that they were feeding their pilots carrots in order to improve their vision. The campaign was SO successful, that folks STILL believe it today! While carrots ARE good for you, and tasty as well, they will, sadly, not give you Superman's x-ray vision.More »
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