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  2. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    The idea of using atomic transitions to measure time was first suggested by the British scientist Lord Kelvin in 1879, [204] although it was only in the 1930s with the development of magnetic resonance that there was a practical method for measuring time in this way. [205] A prototype ammonia maser device was built in 1948 at NIST. Although ...

  3. History of timekeeping devices in Egypt - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping...

    Ancient Egyptian sundial (c. 1500 BC), from the Valley of the Kings, used for measuring work hour. Daytime divided into 12 parts. The ancient Egyptians were one of the first cultures to widely divide days into generally agreed-upon equal parts, using early timekeeping devices such as sundials, shadow clocks, and merkhets (plumb-lines used by early astronomers).

  4. A first-grade teacher changed my name so it'd be easier to ...

    www.aol.com/news/first-grade-teacher-changed...

    My parents named me after traditional family names. A first-grade teacher changed my name so it'd be easier to say in English. I still go by that name because it is now part of my identity.

  5. Lesson plan - Wikipedia

    en.wikipedia.org/wiki/Lesson_plan

    A lesson plan is the teacher's guide for running a particular lesson, and it includes the goal (what the students are supposed to learn), how the goal will be reached (the method, procedure) and a way of measuring how well the goal was reached (test, worksheet, homework etc.).

  6. Gifted education - Wikipedia

    en.wikipedia.org/wiki/Gifted_education

    For the first time, intelligence testing was given to a wide population of drafted soldiers. After the war, Terman undertook an extensive longitudinal study of 643 children in California who scored at IQ 140 or above, the Genetic Studies of Genius, continuing to evaluate them throughout their lives. Subjects of these case studies were called ...

  7. Japanese clock - Wikipedia

    en.wikipedia.org/wiki/Japanese_clock

    Two separate foliot balances allow this 18th-century Japanese clock to run at two different speeds to indicate unequal hours.. A Japanese clock (和時計, wadokei) is a mechanical clock that has been made to tell traditional Japanese time, a system in which daytime and nighttime are always divided into six periods whose lengths consequently change with the season.

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