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The Science of Tanning

There's a lot of controversy surrounding tanning. Some people say a little sun is good for you (it's a source of vitamin D, you know), while others say you should stay in the shade to avoid skin cancer. But how many people really know what's going on in your skin to make you turn brown? Get the good on tanning here!

What is a Tan?

Melanocytes are special skin cells that produce melanin (skin pigment) when they are exposed to ultraviolet light in sunlight. The pigment absorbs UV radiation in sunlight, so it helps to protect skin cells from UV damage. Your body actually produces two kinds of pigmant. One is called eumelanin and it is responsible for the golden brown color we normally associate with tanning. Another pigment is called phaeomelanin and it produces a red color. Redheads and blondes produce more phaeomelanin and less eumelanin, which is why they don't tan as well.

How Does Your Body Know It's Sunny Out?

Sunlight (or UV light from tanning beds) affects the pituitary gland (a gland at the base of the brain that secretes hormones) which then produces MSH (melanocyte-stimulating hormone). This hormone flows through the bloodstream to the melanocytes, which makes them able to produce more melanin. Since the pituitary gland is tied into the optic nerve, (the nerve in your eyes that lets you sense light), wearing sunglasses makes you tan less. Weird.

Tanning and Race

Different races tan differently (and some don't tan at all). Caucasians (white people) and other lighter skinned races tan the way explained above. People of darker races produce melanin continuously (without having to go in the sun), which means their skin is always pigmented (dark) to varying degrees. People of dark races are much less likely to get skin cancer because their cells are constantly protecting them from UV radiation.

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What is the minimum SPF You Should Wear?

  • At least SPF 10
  • SPF 100
  • SPF 30
  • I don't wear sunscreen

Random In The Forums

rainbowpoptart
rainbowpoptart posted in General:
This is probably the cutest thing about growing up I've ever read, I just... Everyone grows up. No one's the exact same person they were 3 years ago, sometimes they're not even the same way they were 3 days ago. Every single is person is going to look back at their past self and cringe at something- something they said, something they did, something they didn't do. It's a sign of maturity. Everyone gets there (eventually; some earlier than others). I came back from a break around two or three months ago and wow did I feel embarrassed. I was in such an extreme scene phase when I made this account and everything was so.. yikes. My bio and albums were scattered with pictures of band members and "emo" YouTubers and I wanted to, like, burn it all (I deleted a lot of them, but the less cringey ones are still there). And my username..? Oh man my username. Not gonna be able to live this one down, that's for sure. I'm going to stay until I'm 18, if I find the time to (which I should because cyber school isn't that time consuming so). Maybe the remnants of 12 year old Kristin are the bane of my existence, but I've made some nice memories here, and I'm looking forward to making many more. (:
reply 14 minutes
AlphaT
AlphaT posted in Debating:
@Boysrock50  Do you mind if my response is lengthy?
reply 19 minutes
Boysrock50
Boysrock50 posted in Debating:
"AlphaT" wrote:   1. He's building a wall to keep illegal immigrants out. Illegal immigrants are people who come into the United States without following our immigration laws. In other words, he's building a wall so that people will stop breaking the law.  2. He's hired many Muslims and has many Muslim friends. His ban on Muslims has recently changed, but even in its' original state, it was a temporary ban meant to combat radical Islam. Trump's Muslim policies have never had anything to do with thinking that all Muslims are bad, it's just that most terrorists are Muslim and a temporary Muslim ban would eliminate most of the terrorists coming into our country.  3. Business deals with politics, and perhaps we need someone who's not a politician? Many have become corrupt, have been found to blatantly lie to their people, have not kept their promises after being elected. If anything, the fact that Trump is successful and yet not a politician is even more of a reason to vote for him.  Honestly, I thought the whole "Trump hates Mexicans and Muslims" thing would have been over by now. It's so obvious that he doesn't hate them, all you have to do is listen to what he says.    1) Just a few issues with the wall, disregarding the purpose. Is the wall going to replace current fencing? There may be major breaches whilst the wall is under construction. Will Trump have permission to build on every inch of land the wall is to be placed upon? How do you expect Mexico to pay for it when they outright refused? The geography alone will not make it easy to build completely along the border. Do you not think the alienating Mexico will create a larger social divide between the two countries? Finally, the engineering alone behind the wall is so implausible, I don't think Trump himself realises just how difficult it will be. 2) "He has many Muslim friends" - Oh dear, the classic anti-racist comment. 'I'm not racist because I'm friends with blacks'. His current proposal is just as absurd as his original proposal. He wants to ban Muslims coming from countries with a terrorist past? (or has he changed his proposal yet again?). Let's see, that consists of almost every country in the world if you want to go back far enough. How far in the past does he want to look? He also mentioned that he wants to suspend immigration of the same people trying to enter countries with US alliance. What, does he plan on flying over and stopping Iraqis from entering the UK? That should be entertaining. This ban though... yes, you're preventing 'Muslim terrorists' from entering the US but you're also preventing 1.5 billion other Muslims from entering. That totally seems fair. Why don't you ban holiday makers from entering the US too, because 1 decided to commit murder in the past? You'll probably get a similar attacker-innocent ratio. 3) Can we stop with the whole idea that being able to run a business means you can run a country? If that were true the UK would have had Sir Alan Sugar in power years ago. He's not even an economist. He probably doesn't even know what a Current Account is. The government isn't a business. The US has a free market economy, not a command economy. Trump isn't going to be a salesman, he's going to be a Prime Minister. It's vital he knows his politics. He may have ideas that people love but he has no idea how to run a country. P.s. I really worry for America's future economy if their idea of a 'successful' businessman is someone who ends up piling on so much debt that his businesses reach bankruptcy. There are countless businessmen more successful than Trump that 90% of people haven't ever heard of. Trump loves to big himself up and so do his supporters. You're making the man sound far greater than he actually is and it's possibly going to cost you the future of your country.
reply about 1 hour
AlphaT
AlphaT posted in Debating:
"KingShawn13" wrote:And now I ask how much of this was the fault of the Presidents before him and how much was actually his fault? It was entirely his fault, or the fault of his administration. The only thing you could blame Bush for is the war in Iraq, but even though Obama didn't start the war in Iraq, he ended it in the worst way possible. 
reply about 1 hour
trinityac
trinityac posted in General:
Don't worry I felt the same way when getting back on this account. I had made it when I was about to turn 11. I am 15 now. Time changes a lot and I am definitely not the same person I was when starting kidzworld. I'm starting my Sophomore year after summer is over and honestly I'll probably try to stick to this website for as long as I can until they lock my account when I'm 18.  
reply about 2 hours