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  2. Mechanically powered flashlight - Wikipedia

    en.wikipedia.org/.../Mechanically_powered_flashlight

    A dyno torch, dynamo torch, or squeeze flashlight is a flashlight or pocket torch which generates energy via a flywheel.The user repeatedly squeezes a handle to spin a flywheel inside the flashlight, attached to a small generator/dynamo, supplying electric current to an incandescent bulb or light-emitting diode.

  3. Cryptocurrency - Wikipedia

    en.wikipedia.org/wiki/Cryptocurrency

    In March 2018, the city of Plattsburgh, New York put an 18-month moratorium on all cryptocurrency mining in an effort to preserve natural resources and the "character and direction" of the city. [76] In 2021, Kazakhstan became the second-biggest crypto-currency mining country, producing 18.1% of the global exahash rate.

  4. Flashlight - Wikipedia

    en.wikipedia.org/wiki/Flashlight

    A set of modern LED flashlights. A flashlight or electric torch (Commonwealth English), usually shortened to torch, is a portable hand-held electric lamp.Formerly, the light source typically was a miniature incandescent light bulb, but these have been displaced by light-emitting diodes (LEDs) since the early 2000s.

  5. How to start investing in cryptocurrency: A guide for beginners

    www.aol.com/finance/start-investing-crypto...

    Crypto exchange or broker stocks: Buying stock in a company that’s poised to profit on the rise of cryptocurrency regardless of the winner could be an interesting option, too.

  6. List of cryptocurrencies - Wikipedia

    en.wikipedia.org/wiki/List_of_cryptocurrencies

    Currency Symbol Founder(s) Hash algorithm Programming language of implementation Cryptocurrency blockchain (PoS, PoW, or other) Notes 2014 Coinye: KOI, COYE Scrypt: PoW: Used American hip hop artist Kanye West as its mascot, abandoned after he filed a trademark lawsuit. OneCoin: Ruja Ignatova and Stephen Greenwood A Ponzi scheme promoted as a ...

  7. Carbide lamp - Wikipedia

    en.wikipedia.org/wiki/Carbide_lamp

    A mining or caving lamp has calcium carbide placed in a lower chamber, the generator. The upper reservoir is then filled with water. A threaded valve or other mechanism is used to control the rate at which the water is allowed to drip into the chamber containing the calcium carbide.

  8. Safety lamp - Wikipedia

    en.wikipedia.org/wiki/Safety_lamp

    Modern flame safety lamp used in mines, manufactured by Koehler. A safety lamp is any of several types of lamp that provides illumination in places such as coal mines where the air may carry coal dust or a build-up of flammable gases, which may explode if ignited, possibly by an electric spark.

  9. Bitcoin - Wikipedia

    en.wikipedia.org/wiki/Bitcoin

    In 2014, mining pool Ghash.io reached 51% mining power, causing safety concerns, but later voluntarily capped its power at 39.99% for the benefit of the whole network. [101] A few entities also dominate other parts of the ecosystem such as the client software, online wallets, and simplified payment verification (SPV) clients.