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Grumpy is the new happy
Express yourself while looking and feeling good doing it. Our shirts are not only expressive, but they're also printed using our specially developed environmentally friendly methods. We care about the environment and know there's a whole lot we can do to make this a better world, starting with our own back yard. The blank shirts we print on are made from the finest cotton, and are guaranteed sweatshop free. So get Grumpy and see how good it feels.
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Radioactive Dinosaurs
From Wikipedia, the free encyclopedia
Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation of a different wavelength. In most cases, emitted light has a longer wavelength, and therefore lower energy, than the absorbed radiation. However, when the absorbed electromagnetic radiation is intense, it is possible for one electron to absorb two photons; this two-photon absorption can lead to emission of radiation having a shorter wavelength than the absorbed radiation.
The most striking examples of fluorescence occur when the absorbed radiation is in the ultraviolet region of the spectrum, and thus invisible, and the emitted light is in the visible region.
George Gabriel Stokes named the phenomenon fluorescence in 1852. He chose the name "to denote the general appearance of a solution of sulphate of quinine and similar media". The name was derived from the mineral fluorite (calcium difluoride), some examples of which contain traces of divalent europium, which serves as the fluorescent activator to emit blue light.
Fluorescence has many practical applications, including mineralogy, gemology, chemical sensors, fluorescent labelling, dyes, biological detectors, and, most commonly, fluorescent lamps.
As far as we know, there were no flourescent Tyranosaurus Rexes.
Until now.
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