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  • The sun is slowly killing you, and so are those UV beds you lay on to darken your skin

  • tone before Prom. What can you do about it?!

  • You've probably seen this viral video in all the dark corners of the web this week, showing

  • what the sun has done to seemingly beautiful skin. It's shocking, but let's add a little

  • context to this random "scientific" video. Ultraviolet light damages all human skin,

  • dark, fair, and all the colors in-between; the reason we even HAVE skin color is an evolutionary

  • response to sunlight damaging human skin.

  • First, what you're seeing in this video is the reflection of UV light. Ultraviolet light

  • works the same as any other light. It's either absorbed or reflected -- darker colors absorb

  • more than lighter. What the camera is showing us, is where the skin is absorbing or reflecting

  • more UV light. The dark spots are where the UV light isn't bouncing back at the camera.

  • UV light is part of the light spectrum, and though it's just outside the visible spectrum

  • for humans, if aliens were to show up tomorrow, they might see us the way this camera does!

  • Some of those freckles, blemishes and spots revealed by the camera are pockets there because

  • the skin is under attack.

  • When UV light hits the skin it can be reflected by our outermost layer of skin, the stratum

  • corneum. It that doesn't catch the radiation, the rays hit the inner layer of skin, the

  • epidermis where it encounters that melanin packaged within melanosomes. When skin is

  • exposed to the ultraviolet rays in sunlight, it darkens, or tans. All skin regardless of

  • color, tans. More melanin scatters more of the damaging UV rays. Melanin in the skin

  • is produced by melanocytes located in the epidermis. And it comes in the form of two

  • pigments the brown eumelanin and a yellow and red phaeomelanin! Dark-skinned humans

  • produce melanin all the time, while lighter-skinned people produce it as needed.The melanin is

  • evolution's way of scattering the rays of UV light before they can harm your DNA, since

  • we no longer have dark body hair to protect us.

  • If our skin didn't do this, the UV radiation would get through, corrupt our DNA, and cause

  • cancer before we could reach breeding age. There were probably human ancestors that didn't

  • tan -- and thus they weren't able to pass on their genes as efficiently. Sunburns are

  • radiation burns from overexposure to ultraviolet radiation. It turns red because your body

  • is trying to heal the damage and sending blood to the area. The burn isn't going to protect

  • you from anything, neither will a tan, really. In the end, ALL sun exposure results in UV

  • light impacting your skin. It is never ending. If it's cloudy, there's UV. When it's snowy

  • the UV can reflect off the snow and cause even MORE problems. When you're in a pool

  • or ocean? Yep. UV.

  • Light-skinned people are most susceptible to skin cancers because they have to make

  • up for not having the melanin in the first place. Darker skinned people scatter more

  • of the UV rays naturally, and therefore have significantly lower incidences of skin cancer,

  • according to the CDC[a]. Obviously, you can use sunscreen, which contains organic and

  • inorganic chemicals to block the UV rays that cause cancers. Some of the molecules absorb

  • the rays and release the energy as heat. However, a new study from the American Chemical Society

  • found an overabundance of sunscreen in the oceans frequented by beachgoers. The titanium

  • dioxide and zinc oxide nanoparticles in the creams and lotions were reacting with UV rays

  • and creating hydrogen peroxide toxins that kill algae and phytoplankton -- the lifebloods

  • of ocean ecosystems. It's a lose-lose. Though it's better to wear it to protect yourself.

  • Maybe we should just go to a movie.

  • In the end, this viral video does NOT show us where people will be getting cancer. It's

  • revealing bits of our skin's protective layer which absorb or reflect light. It's stuff

  • we don't normally see, but it's always there.

  • How does it make you feel to know every moment you spend in sunlight is hurting your body?

  • Warm up the comments with your own sunshiney opinions and thanks for stopping by DNews.

  • Enjoy the rest of the summer, and subscribe for more videos seven days a week!

The sun is slowly killing you, and so are those UV beds you lay on to darken your skin

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B2 中高級

陽光對皮膚到底有什麼影響? (What Exactly Does The Sun Do To Your Skin?)

  • 226 22
    Cheng-Hong Liu 發佈於 2021 年 01 月 14 日
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