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Physics proves that no one really has blue eyes

Le 14 février 2017, 04:38 dans Humeurs 0

Although some people have blue eyes, and many babies are born with particularly deep blue irises, no one actually has blue pigment in their irises. They're just a trick of the light.


With the news of Elizabeth Taylor's death, many people's thoughts have turned to eye color. It's known that her famous violet eyes were mostly the result of make-up and photo coloration, but even outside of the world of starlets many people rhapsodize about blue eyes. This is especially true with parents, who are startled by the deep blue of their babies' eyes. When people say that their children's eyes are sky blue, they're telling the truth. Blue eyes are blue for the same reason the sky is blue - scattered light.


Irises are made up of three layers, a thin top and back layer, with a spongy layer in between called the stroma. Any layer can have pigmentation in it. There are a few different colors of pigment that come into play. Most people have either dark brown or yellow pigment in at least one of these layers. The combination of yellow and brown go into making brown and amber-colored eyes. Brown-eyed people have these pigments are in each layer of the iris, giving the eye a strong brown color.


Blue and grey eyes, on the other hand, only have dark brown pigment on the back layer of the eye. The stroma has no pigment, but it does have small particles suspended in it. These particles give rise to the Tyndall Effect. The small particles in the eye scatter blue light. As light enters the eye, the blue wavelengths are scattered - some of them back towards the outside of the eye. The dark background absorbs most of the rest of light. (If the background of the eye were white, or were lit from within, more light would stream through, the blue wavelengths would be scattered out, and the eyes would look yellow.) Babies can often have blue eyes for a few days or months after birth, because the melanin - the darkening pigment of the eyes - has not fully developed in the stroma.


Even if the overall color of the eye doesn't change, babies and young children tend to have more intensely blue eyes than adults. As people age, the particles in the stroma get bigger, and scatter white light. Add a layer of white is added to the blue, it comes to look more grey. People can see this kind of pigmentation in weather. A dry sky is made up of tiny particles that scatter blue light and make the sky look blue. As clouds start to form water molecules fill the air, and the color of the sky changes to a whitish grey.

Surgery for the Stars

Le 21 décembre 2016, 07:46 dans Humeurs 0

While plastic surgery might remain for many of us something of a pipe dream, the thing we'd do if we won the lottery, for those in the entertainment industry inflatable bounce, it has slowly but surely become akin to an entry pass into Hollywood. While there are still a large percentage of women in the general populace who are quite content to sit around with their girlfriends and talk about what they would have done, there is a certain faction of womankind - though as the pressure to conform to a particular 'look' increases, the male membership of the group increases also - for whom plastic surgery is simply inevitable.


It is very difficult to find a woman in tinsel town whose only surgeon has been the natural passing of time - in fact, there is a growing subsection of the entertainment and gossip industry that thrives off the maudlin reportage of what stars are having done, and how wrong it is going. While there is undoubted interest, and even admiration, for the woman who has had plastic surgery go right, we seem to take greater delight in perusing photograph after photograph of some former beauty who has suffered the misfortune of having something not quite go to plan in the surgery room.


Because regardless of the star who succumbs to the knife, and regardless of the surgeon who wields it, the fates sometimes frown on surgery, and the rich and famous take the same risks with plastic surgery that the rest of us do. But this inherent danger seems to be of little consequence, as the list of surgery supporters grows ever larger reenex facial. And while we continue to gaze with wonder at the beautiful celebrities that fill our magazines, it becomes increasingly difficult to find one that has not yet been surgically enhanced. Because it seems that to succeed in a world where talent is only second best, the surgical manipulation of physical appearance really is inevitable.


Jeff Lakie is the founder of Plastic Surgery Resources a website providing information on cosmetic surgery Unique Beauty.

How to Manage Sleep Apnea

Le 22 novembre 2016, 05:47 dans Humeurs 0

Some 18 million Americans suffer from obstructive sleep apnea. Here are four expert solutions:

The sleep specialist. For those who can use it, PAP (positive airway pressure) therapy is the best fix. Continuous, or CPAP, is a common type. Apnea is a form of sleep disordered breathing (SDB), which causes the airway to collapse partially or fully; pressure (applied through a mask) keeps the airway open. Sleeping pills won't work and could worsen the problem. PAP therapy can also help relieve depression and insomnia. Both may be linked to SDB.

-- Barry Krakow, MD Medical Director nuskin, Sleep and Human Health Institute, Albuquerque, New Mexico 


The acupuncturist. Depending on the cause of the problem, exercise, losing weight and quitting smoking may be beneficial. Try sleeping on your side, not your back. An acupuncturist might place needles on the nose, chest, arms and other points to open the airway and help control the problem. 

-- Anjali Hasija, LAC Satori Holistic Center and Spa, New York, New York 


The respiratory expert. If you're overweight, as most sleep apnea sufferers are, losing weight will inevitably help. PAP therapy is the gold standard, so only if that fails should you try other things, such as dental devices that push your jaw forward while you sleep. They can open the upper airway. And don't drink at night: Alcohol relaxes the upper airway, making it more likely to narrow and collapse. 

-- John Stradling, MD Professor of Respiratory Medicine nuskin, Oxford University, Churchill Hospital, Oxford, United Kingdom 


The surgeon. Surgery should be the last approach. It's the most invasive and it's only successful half the time, even in the best surgeon's hands. If PAP therapy and other treatments fail, only then should you talk to a surgeon about corrective procedures that can improve airflow through both the nose and throat. 

-- Jeffrey Schonberg, MD Otolaryngologist, Head and Neck Surgeon, Chicago, Illinois 


Bottom Line

If your neck size is over 17 inches (16 for women), you're at risk for OSA. You may have heart problems too. And you can't exercise to drop weight if you're tired. Most folks lose weight from the neck quickly, so a 5% loss will reduce OSA symptoms. Cutting out alcohol may helpevod pro kit .

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