I need a marker.

Phew!

Phew! That was close!

But UVB and UVA especially, came in unimpeded.

It seems that marking is just a green marker.

Ooh! It took a weight off my shoulders.

UVB turns out to be incredibly important.

We're still getting a dose of UVA.

No, they think, Ugh. I have to go buy gas.

I laughed so hard that I cried.

The UV light reduces the iron(III) to iron(II).

Look at some of the major latitudinal transgressions people from high UV areas going to low UV and vice versa.

But it's all UVA, and, significantly, that UVA has no ability to make vitamin D in your skin.

Some of us with lightly pigmented skin live in high UV areas.

Some of us with darkly pigmented skin live in low UV areas.

'They have been ready a long time,' replied the marker, who had already placed the balls in a triangle and was rolling the red ball about to pass the time.

Between 1520 and 1867, 12 million, 500 people were moved from high UV to low UV areas in the transatlantic slave trade.

Let's first look at the relationship of ultraviolet radiation to the Earth's surface.

The UVC, the most energetic type, was occluded by the Earth's atmosphere.

But all of the UVB, or nearly all of it, is dissipated through the thickness of the atmosphere.

UV absorption leads to chain degradation and loss of strength at sensitive points in the chain structure.

In the winter, when you are skiing in the Alps, you may experience ultraviolet radiation.

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In those early days of our evolution, looking at the equator, we were bombarded by high levels of ultraviolet radiation.

So if we're somewhere in the Northern Hemisphere, look at what's happening to the ultraviolet radiation.

Likewise, an electromagnetic wave can have a frequency higher than , but it will be invisible to the human eye such waves are called ultraviolet (UV) radiation.

When we looked at their PSA levels which is a marker for prostate cancer they got worse in the control group, but they actually got better in the experimental group, and these differences were highly significant.

What's very, very important here is that the earliest humans evolved in high UV environments, in equatorial Africa.

The ozone layer plays an important role in depleting the amount of ultraviolet (UV) radiation that reaches the surface.

Now the really hot pink and red areas are those parts of the world that receive the highest amounts of UV during the year.

The incrementally cooler colors blues, greens, yellows, and finally grays indicate areas of much lower ultraviolet radiation.

And what Darwin could not appreciate, or didn't perhaps want to appreciate at the time, is that there was a fundamental relationship between the intensity of ultraviolet radiation and skin pigmentation.

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Where it protected the body against the degradations of ultraviolet radiation, the destruction, or damage to DNA, and the breakdown of a very important molecule called folate, which helps to fuel cell production, and reproduction in the body.

And one of the designers ran out of the room and grabbed a white board marker and a film canister which is now becoming a very precious prototyping medium and a clothespin. He taped them all together, ran back into the room and said, You mean, something like this?