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  2. Viking (rocket engine) - Wikipedia

    en.wikipedia.org/wiki/Viking_(rocket_engine)

    An unusual feature of the Viking engines is their water tank and water pump, used to cool the exhaust gasses of the gas generator. The hot exhaust of the gas generator is cooled by water injection to 620 °C before being used to drive the three coaxial pumps (for water, fuel and oxidizer) and to pressurize the fuel tanks. The water was also ...

  3. Gear pump - Wikipedia

    en.wikipedia.org/wiki/Gear_pump

    Oil pump from a scooter engine. A gear pump uses the meshing of gears to pump fluid by displacement. [1] They are one of the most common types of pumps for hydraulic fluid power applications. The gear pump was invented around 1600 by Johannes Kepler. [2] Gear pumps are also widely used in chemical installations to pump high-viscosity fluids.

  4. Calculator watch - Wikipedia

    en.wikipedia.org/wiki/Calculator_watch

    Another popular calculator watch was the Time Computer Calculator 901, which could perform basic arithmetic functions. The 902 models had additional functions such as percentage calculations. The Time watches carried a high price tag (US$4,000) because they were made of solid gold and operated by a stylus pen owing to the small size of their ...

  5. ‘I Swapped Walks For Indoor Walking Workouts And Found An ...

    www.aol.com/swapped-walks-indoor-walking...

    Read on for the top indoor walking workouts to try on YouTube. '6 things I learned from trying indoor walking workouts' 1.They involve more than just walking on the spot

  6. AOL Mail is free and helps keep you safe.

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

  8. American kids got a D- in physical activity. What does that ...

    www.aol.com/american-kids-got-d-physical...

    We can always encourage our athletes to sleep more. Have kids aged 6-to-12 get 9-to-12 hours per night and 13-to-18 get 8-to-10, the American Academy of Sleep Medicine says.

  9. Peristaltic pump - Wikipedia

    en.wikipedia.org/wiki/Peristaltic_pump

    A peristaltic pump, also commonly known as a roller pump, is a type of positive displacement pump used for pumping a variety of fluids. The fluid is contained in a flexible tube fitted inside a circular pump casing. Most peristaltic pumps work through rotary motion, though linear peristaltic pumps have also been made.