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  2. Standard-gauge railway - Wikipedia

    en.wikipedia.org/wiki/Standard-gauge_railway

    The gauge between the interior edges of the rails (the measurement adopted from 1844) differed slightly between countries, and even between networks within a country (for example, 1,440 mm or 4 ft 8 + 11 ⁄ 16 in to 1,445 mm or 4 ft 8 + 7 ⁄ 8 in in France).

  3. Blu-ray - Wikipedia

    en.wikipedia.org/wiki/Blu-Ray

    Pre-recorded Blu-ray Disc titles usually ship in packages similar to, but slightly smaller (18.5 mm shorter and 2 mm thinner: 135 mm × 171.5 mm × 13 mm [138]) and more rounded than, a standard DVD keep case, generally with the format prominently displayed in a horizontal stripe across the top of the case (translucent blue for Blu-ray video ...

  4. One half - Wikipedia

    en.wikipedia.org/wiki/One_half

    One half is the rational number that lies midway between 0 and 1 on the number line. Multiplication by one half is equivalent to division by two, or "halving"; conversely, division by one half is equivalent to multiplication by two, or "doubling". A square of side length one, here dissected into rectangles whose areas are successive powers of ...

  5. Hubble Space Telescope - Wikipedia

    en.wikipedia.org/wiki/Hubble_Space_Telescope

    The Hubble Space Telescope (HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versatile, renowned as a vital research tool and as a public relations boon for astronomy.

  6. Shroud of Turin - Wikipedia

    en.wikipedia.org/wiki/Shroud_of_Turin

    This is an accepted version of this page This is the latest accepted revision, reviewed on 18 February 2025. Cloth bearing the alleged image of Jesus Shroud of Turin The Shroud of Turin: modern photo of the face, positive (left), and digitally processed image (right) Material Linen Size 4.4 m × 1.1 m (14 ft 5 in × 3 ft 7 in) Present location Chapel of the Holy Shroud, Turin, Italy Period ...

  7. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    Very small (1.6×1.6×0.35 mm) red, green, and blue surface mount miniature LED package with gold wire bonding details. These are mostly single-die LEDs used as indicators, and they come in various sizes from 1.8 mm to 10 mm, through-hole and surface mount packages. [47] Typical current ratings range from around 1 mA to above 20 mA.