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  2. Gmail - Wikipedia

    en.wikipedia.org/wiki/Gmail

    Gmail is the email service provided by Google. As of 2019, it had 1.5 billion active users worldwide, making it the largest email service in the world. [1] It also provides a webmail interface, accessible through a web browser, and is also accessible through the official mobile application. Google also supports the use of third-party email ...

  3. Luhn algorithm - Wikipedia

    en.wikipedia.org/wiki/Luhn_algorithm

    It is described in U.S. Patent No. 2,950,048, granted on August 23, 1960. The algorithm is in the public domain and is in wide use today. It is specified in ISO/IEC 7812-1. It is not intended to be a cryptographically secure hash function; it was designed to protect against accidental errors, not malicious attacks. Most credit cards and many ...

  4. Card-not-present transaction - Wikipedia

    en.wikipedia.org/wiki/Card-not-present_transaction

    A charge of $9 was processed on about one million credit cards over the four-year period. Each card was billed a single time. Credit card companies only investigate if the charge is more than $10 because it costs about that much to run an investigation.

  5. Gold Codes - Wikipedia

    en.wikipedia.org/wiki/Gold_Codes

    Gold Codes. The Gold Code is the launch code for nuclear weapons provided to the President of the United States in their role as commander-in-chief of the armed forces. [1] In conjunction with the nuclear football, the Gold Codes allow the president to authorize a nuclear attack. [2] Gold Codes, as well as a separate nuclear football, are also ...

  6. Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

  7. Schrödinger's cat - Wikipedia

    en.wikipedia.org/wiki/Schrödinger's_cat

    Schrödinger's cat: a cat, a flask of poison, and a radioactive source connected to a Geiger counter are placed in a sealed box. As illustrated, the quantum description uses a superposition of an alive cat and one that has died. In quantum mechanics, Schrödinger's cat is a thought experiment, sometimes described as a paradox, of quantum ...