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  1. S

    How do I test for UV light in colored LEDs?

    http://www.stevespanglerscience.com/product/color-changing-uv-beads [Broken] Cheap plastic beads that change color in UV light.
  2. S

    How quickily does a photon reach c?

    Now, when a photon is transitioning through a boundry, it must accelerate right?
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