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  2. Twin paradox - Wikipedia

    en.wikipedia.org/wiki/Twin_paradox

    Consider a space ship traveling from Earth to the nearest star system: a distance d = 4 light years away, at a speed v = 0.8c (i.e., 80% of the speed of light). To make the numbers easy, the ship is assumed to attain full speed in a negligible time upon departure (even though it would actually take about 9 months accelerating at 1 g to get up ...

  3. The best stationary bikes for seniors in 2025 - AOL

    www.aol.com/lifestyle/best-stationary-bikes...

    The Horizon 7.0 IC Indoor Cycle is a good midrange option for people who are new to cycling and aren’t sure if they want to invest a lot of money. ... The 87-pound weight might seem light, but ...

  4. Johnson Health Tech - Wikipedia

    en.wikipedia.org/wiki/Johnson_Health_Tech

    Horizon Fitness: A Cottage Grove, Wisconsin-based [6] company that manufactures treadmills, stationary bicycles, elliptical trainers for domestic use. Advanced Fitness Groups (AFG) : Also a Cottage Grove, Wisconsin-based subsidiary [ 7 ] that acts as a semi-exclusive name brand for Sears (in the United States) and Canadian Tire (in Canada) [ 8 ]

  5. Treadmill - Wikipedia

    en.wikipedia.org/wiki/Treadmill

    Example of modern treadmill. A treadmill is a device generally used for walking, running, or climbing while staying in the same place.Treadmills were introduced before the development of powered machines to harness the power of animals or humans to do work, often a type of mill operated by a person or animal treading the steps of a treadwheel to grind grain.

  6. Dead man's switch - Wikipedia

    en.wikipedia.org/wiki/Dead_man's_switch

    Interest in dead man's controls increased with the introduction of electric trams (streetcars in North America) and especially electrified rapid transit trains. The first widespread use came with the introduction of the mass-produced Birney One-Man Safety (tram) Car, though dead-man equipment was fairly rare on US streetcars until the successful PCC streetcar, which had a left-foot-operated ...

  7. Meta Horizon OS version history - Wikipedia

    en.wikipedia.org/wiki/Meta_Horizon_OS_version...

    Meta Horizon OS has gone through several changes since the release of the Oculus Rift DK1 on March 29, 2013.. The operating system has been updated on a roughly monthly basis since the v1.0 release in 2016, and was gradually ported from a proprietary embedded operating system to Android starting in 2015, first for the Samsung Gear VR and later for its own headsets.

  8. Red Queen's race - Wikipedia

    en.wikipedia.org/wiki/Red_Queen's_race

    As depicted by John Tenniel in Chapter Two – The Garden of Live Flowers. The Red Queen's race is an incident that appears in Lewis Carroll's Through the Looking-Glass and involves both the Red Queen, a representation of a Queen in chess, and Alice constantly running but remaining in the same spot.

  9. Treadmill desk - Wikipedia

    en.wikipedia.org/wiki/Treadmill_desk

    The recommended speed for walking on a treadmill while working at a computer is less than 2 miles per hour. To prevent injury, treadmill desks require compliance with the same ergonomic safety standards recommended for any computer desk, including placement such that the user's wrists are flat by the keyboard, their elbows form a 90-degree angle when typing, and their eyes may look forward to ...