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  2. Kerchief - Wikipedia

    en.wikipedia.org/wiki/Kerchief

    Bandanas are frequently printed in a paisley pattern and are most often used to hold hair back, either as a fashionable head accessory or for practical purposes. It is also used to tie around the neck to prevent sunburn, and around the mouth and nose to protect from dust inhalation or to hide the identity of its wearer.

  3. Handkerchief code - Wikipedia

    en.wikipedia.org/wiki/Handkerchief_code

    The handkerchief code (also known as the hanky/hankie code, the bandana/bandanna code, and flagging) [1] is a system of color-coded cloth handkerchief or bandanas for non-verbally communicating one's interests in sexual activities and fetishes. The color of the handkerchief identifies a particular activity, and the pocket it is worn in (left or ...

  4. Polymerase chain reaction - Wikipedia

    en.wikipedia.org/wiki/Polymerase_chain_reaction

    A strip of eight PCR tubes, each containing a 100 μL reaction mixture Placing a strip of eight PCR tubes into a thermal cycler. The polymerase chain reaction (PCR) is a method widely used to make millions to billions of copies of a specific DNA sample rapidly, allowing scientists to amplify a very small sample of DNA (or a part of it) sufficiently to enable detailed study.

  5. Social media - Wikipedia

    en.wikipedia.org/wiki/Social_media

    The PLATO system was launched in 1960 at the University of Illinois and subsequently commercially marketed by Control Data Corporation.It offered early forms of social media features with innovations such as Notes, PLATO's message-forum application; TERM-talk, its instant-messaging feature; Talkomatic, perhaps the first online chat room; News Report, a crowdsourced online newspaper, and blog ...

  6. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_Code

    The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [6] [7] [8] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [9] the pattern of the position detection markers was determined by finding the least-used sequence of ...

  7. Cheque - Wikipedia

    en.wikipedia.org/wiki/Cheque

    Not all of the MICR characters have been printed at the time the cheque is written, as additional characters will be printed later to encode the amount; thus a sloppy signature could obscure characters that will later be printed there. Since MICR characters are no longer necessarily printed in magnetic ink and will be scanned by optical rather ...

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