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  2. Crossword abbreviations - Wikipedia

    en.wikipedia.org/wiki/Crossword_abbreviations

    Roman numerals: for example the word "six" in the clue might be used to indicate the letters VI; The name of a chemical element may be used to signify its symbol; e.g., W for tungsten; The days of the week; e.g., TH for Thursday; Country codes; e.g., "Switzerland" can indicate the letters CH; ICAO spelling alphabet: where Mike signifies M and ...

  3. Thermal radiation - Wikipedia

    en.wikipedia.org/wiki/Thermal_radiation

    Human skin has an emissivity of very close to 1.0. [30] A human, having roughly 2 m 2 in surface area, and a temperature of about 307 K , continuously radiates approximately 1000 W. If people are indoors, surrounded by surfaces at 296 K, they receive back about 900 W from the wall, ceiling, and other surroundings, resulting in a net loss of 100 W.

  4. The Riddle of the Sphinx (Inside No. 9) - Wikipedia

    en.wikipedia.org/wiki/The_Riddle_of_the_Sphinx...

    The puzzle worked independently of any references to Inside No. 9, but included "an extra layer for [Inside No. 9] viewers". [22] A crossword written for a brief appearance in the BBC's Dracula was published in 2020, [23] and Pemberton also published a crossword featuring a nina requesting points from Greg Davies as part of his appearance on ...

  5. St. Elmo's fire - Wikipedia

    en.wikipedia.org/wiki/St._Elmo's_fire

    Illustration of St. Elmo's fire on a ship at sea Electrostatic discharge flashes across the windscreen of a KC-10 cockpit.. St. Elmo's fire (also called witchfire or witch's fire) [1] is a weather phenomenon in which luminous plasma is created by a corona discharge from a rod-like object such as a mast, spire, chimney, or animal horn [2] in an atmospheric electric field.

  6. Human skin - Wikipedia

    en.wikipedia.org/wiki/Human_skin

    Human skin pigmentation varies substantially between populations; this has led to the classification of people(s) on the basis of skin colour. [3] In terms of surface area, the skin is the second largest organ in the human body (the inside of the small intestine is 15 to 20 times larger).

  7. Chemiluminescence - Wikipedia

    en.wikipedia.org/wiki/Chemiluminescence

    Green and blue glow sticks. One of the oldest known chemiluminescent reactions is that of elemental white phosphorus oxidizing in moist air, producing a green glow. This is a gas-phase reaction of phosphorus vapor, above the solid, with oxygen producing excited states of (PO) 2 and HPO. [7]

  8. Iridescence - Wikipedia

    en.wikipedia.org/wiki/Iridescence

    Examples of iridescence include soap bubbles, feathers, butterfly wings and seashell nacre, and minerals such as opal. Pearlescence is a related effect where some or most of the reflected light is white. The term pearlescent is used to describe certain paint finishes, usually in the automotive industry, which actually produce iridescent effects.

  9. Magic word - Wikipedia

    en.wikipedia.org/wiki/Magic_word

    Examples of traditional and modern magic words include: [1] Abracadabra – magic word used by magicians. Ajji Majji la Tarajji – Iranian magic word (Persian). [citation needed] Alakazam – a phrase used by magicians. [2] Chhu Montor Chhu – a phrase used by magicians in Bangladesh. Hocus pocus – a phrase used by magicians.