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  2. Science book - Wikipedia

    en.wikipedia.org/wiki/Science_book

    A science book is a work of nonfiction, usually written by a scientist, researcher, or professor like Stephen Hawking (A Brief History of Time), or sometimes by a non-scientist such as Bill Bryson (A Short History of Nearly Everything).

  3. Third grade - Wikipedia

    en.wikipedia.org/wiki/Third_grade

    In Brazil, third grade is the terceiro ano do Ensino Fundamental I, in this case, children begin their first year of elementary school at age 6 or 7 depending on their birthdate. Therefore, the 3rd year of elementary school is typically for students of 8 (96 months)–9 years (108 months) of age.

  4. Crest and trough - Wikipedia

    en.wikipedia.org/wiki/Crest_and_trough

    Crest and trough in a wave. A Crest point on a wave is the highest point of the wave. A crest is a point on a surface wave where the displacement of the medium is at a maximum. A trough is the opposite of a crest, so the minimum or lowest point of the wave.

  5. The Tunnel Thru the Air; Or, Looking Back from 1940 - Wikipedia

    en.wikipedia.org/wiki/The_Tunnel_Thru_the_Air;...

    The Tunnel Thru the Air, Or, Looking Back from 1940 is a science fiction novel written by market forecaster William Delbert Gann in 1927. [1] In the Foreword, Gann hinted that this book is more than just a novel because it "contains a valuable secret, clothed in veiled language.

  6. Spot the difference - Wikipedia

    en.wikipedia.org/wiki/Spot_the_difference

    Solving "Spot the difference" by overlaying the left image (top left) with an inverse image (bottom left) of the right one (top right). Differences appear as non grey parts (bottom right) A way to solve a spot the difference puzzle digitally is to create a inverse version of one of the images to compare and to overlay it 50% on the other one.

  7. Transparency and translucency - Wikipedia

    en.wikipedia.org/wiki/Transparency_and_translucency

    The size of this acceptance cone is a function of the refractive index difference between the fiber's core and cladding. Optical waveguides are used as components in integrated optical circuits (e.g., combined with lasers or light-emitting diodes , LEDs) or as the transmission medium in local and long-haul optical communication systems.

  8. Trough level - Wikipedia

    en.wikipedia.org/wiki/Trough_level

    In a medicine that is administered periodically, the trough level should be measured just before the administration of the next dose in order to avoid overdosing. [3] A trough level is contrasted with a "peak level" (C max), which is the highest level of the medicine in the body, and the "average level", which is the mean level over time. It is ...

  9. Outline of science - Wikipedia

    en.wikipedia.org/wiki/Outline_of_science

    The following outline is provided as a topical overview of science; the discipline of science is defined as both the systematic effort of acquiring knowledge through observation, experimentation and reasoning, and the body of knowledge thus acquired, the word "science" derives from the Latin word scientia meaning knowledge. A practitioner of ...