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  2. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    An Egyptian method of determining the time during the night, used from at least 600 BC, was a type of plumb-line called a merkhet. A north–south meridian was created using two merkhets aligned with Polaris, the north pole star. The time was determined by observing particular stars as they crossed the meridian. [24]

  3. Pendulum clock - Wikipedia

    en.wikipedia.org/wiki/Pendulum_clock

    A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. The advantage of a pendulum for timekeeping is that it is an approximate harmonic oscillator: It swings back and forth in a precise time interval dependent on its length, and resists swinging at other rates.

  4. Blaster Learning System - Wikipedia

    en.wikipedia.org/wiki/Blaster_Learning_System

    The games primarily focused on mathematics, later expanding into language arts and science, and spawned an animated children’s television series in 1999 called Blaster's Universe. Starting in 2011, development of the series focused on an online version of Math Blaster played through a browser or mobile app rather than standalone game software ...

  5. Early Learning House - Wikipedia

    en.wikipedia.org/wiki/Early_Learning_House

    The game was reviewed in the Oppenheim Toy Portfolio Guide Book where the authors described the "six quality math games" as appropriate for children aged three to six. [ 19 ] A reviewer from SuperKids said Bailey's Book House was a "classic" and a "must-have" within the early learning genre. [ 20 ]

  6. Why your favorite catalogs are smaller this holiday season

    www.aol.com/news/why-favorite-catalogs-smaller...

    Honey, they shrunk the catalogs. While retailers hope to go big this holiday season, customers may notice that the printed gift guides arriving in their mailboxes are smaller. Many of the millions ...

  7. Time in physics - Wikipedia

    en.wikipedia.org/wiki/Time_in_physics

    t is the time between these same two events, but as measured in the stationary reference frame; v is the speed of the moving reference frame relative to the stationary one; c is the speed of light. Moving objects therefore are said to show a slower passage of time. This is known as time dilation.

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