This local water will be treated and then distributed using a separate purple pipe.

UV stand for ultraviolet. It is even more violet than purple.

High frequency light waves look violet,

See more photos under the hashtag dedosmorados (purple fingers)

However, this was a disadvantage in the more southern climates, where increased UV radiation led to cancer and decreased fertility.

For two years, I searched for a fiber that could survive ultraviolet rays, salt, air, pollution, and at the same time remain soft enough to move fluidly in the wind.

Nuclear power to get 16 lightbulbs per person, you'd need two gigawatts at each of the purple dots on the map.

If we had UV eyes or X ray eyes, we would really see the dynamic and dramatic effects of our Sun's magnetic activity the kind of thing that happens on other stars as well.

And what we've shown is that doing a sham irradiation this is the thick line here this is shining UV on the arm so it warms up but keeping it covered so the rays don't hit the skin.

Solar radiation is energy in the form of electromagnetic radiation from the infrared (long) to the ultraviolet (short) wavelengths.

I think there's something poetic here, that these pictures taken with ultraviolet filter, the main use of that filter is for astronomers to take pictures of Venus actually the clouds of Venus.

The problem was to ensure that as much light as possible was given off by visible waves rather than ultraviolet or infrared.

If we had UV eyes or X ray eyes, we would really see the dynamic and dramatic effects of our Sun's magnetic activity the kind of thing that happens on other stars as well.

For two years, I searched for a fiber that could survive ultraviolet rays, salt, air, pollution, and at the same time remain soft enough to move fluidly in the wind.

As the temperature increases, the peak shifts to shorter wavelengths, producing first a red glow, then a white one, and finally a blue white colour as the peak moves out of the visible part of the spectrum and into the ultraviolet.

Within about 20 minutes of ultraviolet exposure in light skinned individuals (three to six times longer for pigmented skin), the concentrations of vitamin D precursors produced in the skin reach an equilibrium, and any further vitamin D produced is degraded.

Specifically, Planck's quantum theory of fussy light tells us that light bulb filaments should be heated to a temperature of about 3200 Kelvin to ensure that most of the energy is emitted as visible waves much hotter, and we'd start tanning from the ultraviolet light.

Photonics is the science of generating, controlling, and detecting photons (packets of light), particularly in the visible and near Infrared, but also extending to the Ultraviolet, Infrared and far IR portions of the electromagnetic spectrum.

And a couple of years after that, they'll be able to see in ultraviolet, they'll be able to see in infrared, they'll be able to focus their eyes, they'll be able to come into a microfocus.

I think there's something poetic here, that these pictures taken with ultraviolet filter, the main use of that filter is for astronomers to take pictures of Venus actually the clouds of Venus.

In this visually dazzling talk, Jonathan Drori shows the extraordinary ways flowering plants over a quarter million species have evolved to attract insects to spread their pollen growing 'landing strips' to guide the insects in, shining in ultraviolet, building elaborate traps, and even mimicking other insects in heat.