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  2. Hourglass - Wikipedia

    en.wikipedia.org/wiki/Hourglass

    An hourglass (or sandglass, sand timer, or sand clock) is a device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated flow of a substance (historically sand ) from the upper bulb to the lower one due to gravity .

  3. The Letter People - Wikipedia

    en.wikipedia.org/wiki/The_Letter_People

    Alpha One, also known as Alpha One: Breaking the Code, was a first and second grade program introduced in 1968, and revised in 1974, [8] that was designed to teach children to read and write sentences containing words containing three syllables in length and to develop within the child a sense of his own success and fun in learning to read by using the Letter People characters. [9]

  4. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    Download as PDF; Printable version ... comparing its local time with the clock time. ... to 30 billionths of a second per year. [206] Atomic clocks have ...

  5. Clock - Wikipedia

    en.wikipedia.org/wiki/Clock

    An analog pendulum clock made around 18th century. A clock or chronometer is a device that measures and displays time.The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month, and the year.

  6. JumpStart - Wikipedia

    en.wikipedia.org/wiki/JumpStart

    The Houston Chronicle praised the series for "offer[ing] many and varied academic activities, plenty of play-oriented pursuits, incentives to spur and reward achievement and all the interactive trimmings – cool characters, great 3-D graphics and snappy sound effects", describing the World Kindergarten, 1st Grade and 2nd Grade as superlative ...

  7. Time zone - Wikipedia

    en.wikipedia.org/wiki/Time_zone

    Time zones of the world. A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.

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