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  2. List of most-viewed YouTube videos - Wikipedia

    en.wikipedia.org/wiki/List_of_most-viewed...

    Specifically, to count as a legitimate view, a user must intentionally initiate the playback of the video and play at least 30 seconds of the video (or the entire video for shorter videos). Additionally, while replays count as views, there is a limit of 4 or 5 views per IP address during a 24-hour period, after which point, no further views ...

  3. Celestron - Wikipedia

    en.wikipedia.org/wiki/Celestron

    Celestron was the first large scale commercial manufacturer of the Schmidt-Cassegrain telescope, introducing its "C8" 8" diameter 2032 mm focal length, ƒ10 telescope in 1970. [7] The primary innovation Celestron/Tom Johnson devised was a method to produce Schmidt corrector plates using a vacuum to pull the glass blanks into a pre-shaped curve ...

  4. Energy-dispersive X-ray diffraction - Wikipedia

    en.wikipedia.org/wiki/Energy-dispersive_X-ray...

    Schematic of a typical EDXRD experiment. Energy-dispersive X-ray diffraction (EDXRD) is an analytical technique for characterizing materials.It differs from conventional X-ray diffraction by using polychromatic photons as the source and is usually operated at a fixed angle. [1]

  5. Nikon AF-S DX Zoom-Nikkor 55-200mm f/4-5.6G - Wikipedia

    en.wikipedia.org/wiki/Nikon_AF-S_DX_Zoom-Nikkor...

    The 55-200mm AF-S lens is a medium telephoto zoom lens manufactured by Nikon for use on Nikon DX format digital SLR cameras. It comes in three variants: AF-S DX Zoom-Nikkor 55-200mm f /4–5.6 G ED, released in 2005 [1] AF-S DX Zoom-Nikkor 55-200mm f /4–5.6 G VR IF-ED, released in 2007, adds internal focusing (IF) and, most notably, vibration ...

  6. TV and FM DX - Wikipedia

    en.wikipedia.org/wiki/TV_and_FM_DX

    TV DX and FM DX is the active search for distant radio or television stations received during unusual atmospheric conditions. The term DX is an old telegraphic term meaning "long distance."

  7. Nature documentary - Wikipedia

    en.wikipedia.org/wiki/Nature_documentary

    A nature documentary or wildlife documentary is a genre of documentary film or series about animals, plants, or other non-human living creatures. Nature documentaries usually concentrate on video taken in the subject's natural habitat , but often including footage of trained and captive animals, too.

  8. DX-pedition - Wikipedia

    en.wikipedia.org/wiki/DX-pedition

    A DX-pedition is an expedition to what is considered an exotic place by amateur radio operators and DX listeners, typically because of its remoteness, access restrictions, or simply because there are very few radio amateurs active from that place. This could be an island, a country, or even a particular spot on a geographical grid.

  9. Nature Electronics - Wikipedia

    en.wikipedia.org/wiki/Nature_Electronics

    Nature Electronics is a monthly peer-reviewed scientific journal published by Nature Portfolio. It was established in 2018. The editor-in-chief is Owain Vaughan. [1]

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