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  2. Emission theory (vision) - Wikipedia

    en.wikipedia.org/wiki/Emission_theory_(vision)

    Illustration from System der visuellen Wahrnehmung beim Menschen (1687) depicting emission theory.. Emission theory or extramission theory (variants: extromission) or extromissionism is the proposal that visual perception is accomplished by eye beams emitted by the eyes.

  3. 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 ...

  4. Acrostic (puzzle) - Wikipedia

    en.wikipedia.org/wiki/Acrostic_(puzzle)

    Letters 16 and 17 form a two-letter word ending in P. Since this has to be UP, letter 16 is a U, which can be filled into the appropriate clue answer in the list of clues. Likewise, a three-letter word starting with A could be and, any, all, or even a proper name like Ann. One might need more clue answers before daring to guess which it could be.

  5. Crossword - Wikipedia

    en.wikipedia.org/wiki/Crossword

    An American-style 15×15 crossword grid layout. A crossword (or crossword puzzle) is a word game consisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues. Each white square is typically filled with one ...

  6. Cryptic crossword - Wikipedia

    en.wikipedia.org/wiki/Cryptic_crossword

    A 15x15 lattice-style grid is common for cryptic crosswords. A cryptic crossword is a crossword puzzle in which each clue is a word puzzle. Cryptic crosswords are particularly popular in the United Kingdom, where they originated, [1] as well as Ireland, the Netherlands, and in several Commonwealth nations, including Australia, Canada, India, Kenya, Malta, New Zealand, and South Africa.

  7. Bioluminescence - Wikipedia

    en.wikipedia.org/wiki/Bioluminescence

    [49] [54] Click beetles emit an orange light from the abdomen when flying and a green light from the thorax when they are disturbed or moving about on the ground. The former is probably a sexual attractant but the latter may be defensive. [ 49 ]

  8. Beta decay - Wikipedia

    en.wikipedia.org/wiki/Beta_decay

    The two types of beta decay are known as beta minus and beta plus.In beta minus (β −) decay, a neutron is converted to a proton, and the process creates an electron and an electron antineutrino; while in beta plus (β +) decay, a proton is converted to a neutron and the process creates a positron and an electron neutrino. β + decay is also known as positron emission.

  9. Emit - Wikipedia

    en.wikipedia.org/wiki/Emit

    Emit may refer to: Emit, North Carolina, an unincorporated community; Em:t Records, a British record label that specializes in ambient music; Emmet (Cornish), Cornish derogatory slang for a tourist or newcomer; EMIT or Enzyme multiplied immunoassay technique, a common drug test; Emit