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  2. Terrestrial gamma-ray flash - Wikipedia

    en.wikipedia.org/wiki/Terrestrial_gamma-ray_flash

    A terrestrial gamma-ray flash (TGF), also known as dark lightning, is a burst of gamma rays produced in Earth's atmosphere. TGFs have been recorded to last 0.2 to 3.5 milliseconds , and have energies of up to 20 million electronvolts .

  3. Flash powder - Wikipedia

    en.wikipedia.org/wiki/Flash_powder

    The stoichiometric ratio is 34.2% aluminum and 65.8% perchlorate by mass. A ratio of seven parts potassium perchlorate to three parts dark pyro aluminium is the composition used by most pyrotechnicians. For best results, the aluminium powder should be "Dark Pyro" grade, with a flake particle shape, and a particle size of fewer than 10 micrometres.

  4. Eigengrau - Wikipedia

    en.wikipedia.org/wiki/Eigengrau

    An example of noise observed in the dark An example of noise observed in the dark #2. Eigengrau (German for "intrinsic gray"; pronounced [ˈʔaɪ̯gŋ̍ˌgʁaʊ̯] ⓘ), also called Eigenlicht (Dutch and German for "intrinsic light"), dark light, or brain gray, is the uniform dark gray background color that many people report seeing in the ...

  5. Mechanically powered flashlight - Wikipedia

    en.wikipedia.org/wiki/Mechanically_powered...

    A dyno torch, dynamo torch, or squeeze flashlight is a flashlight or pocket torch which generates energy via a flywheel.The user repeatedly squeezes a handle to spin a flywheel inside the flashlight, attached to a small generator/dynamo, supplying electric current to an incandescent bulb or light-emitting diode.

  6. All of the best Black Friday deals: Amazon, Walmart, Wayfair ...

    www.aol.com/lifestyle/all-of-the-best-black...

    Vertical Charcoal Smoker, $60 (was $130) at Walmart Stand Up Weed Puller Tool , $20 (was $30) at Walmart Bugatti Classic 2-Piece Hardside Luggage Set , $190 (was $500) at Nordstrom

  7. Nitrocellulose - Wikipedia

    en.wikipedia.org/wiki/Nitrocellulose

    Nitrocellulose (also known as cellulose nitrate, flash paper, flash cotton, guncotton, pyroxylin and flash string, depending on form) is a highly flammable compound formed by nitrating cellulose through exposure to a mixture of nitric acid and sulfuric acid.

  8. AOL reviewed: The Technivorm Moccamaster coffee maker is ...

    www.aol.com/lifestyle/technivorm-moccamaster...

    Technivorm Moccamaster KBGV 10-Cup Coffee Maker While pricey, this stylish coffee machine is an attractive addition to any kitchen counter, and it also makes smooth, consistent coffee that tastes ...

  9. Earthquake light - Wikipedia

    en.wikipedia.org/wiki/Earthquake_light

    An earthquake light also known as earthquake lightning or earthquake flash is a luminous optical phenomenon that appears in the sky at or near areas of tectonic stress, seismic activity, or volcanic eruptions. [1]

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