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  2. Inca technology - Wikipedia

    en.wikipedia.org/wiki/Inca_technology

    Inca's infrastructure and water supply system have been hailed as “the pinnacle of the architectural and engineering works of the Inca civilization”. [1] Major Inca centers were chosen by experts who decided the site, its apportionment, and the basic layout of the city. In many cities we see great hydraulic engineering marvels.

  3. List of pre-Columbian inventions and innovations of ...

    en.wikipedia.org/wiki/List_of_pre-Columbian...

    Inca road systems – the Inca built one of the most extensive road systems in the ancient world. The Incas built upon the roads, which were originally constructed by previous Andean civilizations such as the Chimu, Nazca, Wari, Moche, and others. The Inca also further refined and expanded upon the earlier innovations and systems laid in place ...

  4. Arthur Wynne - Wikipedia

    en.wikipedia.org/wiki/Arthur_Wynne

    He is best known for the invention of the crossword puzzle in 1913, when he was a resident of Cedar Grove, New Jersey. [5] Wynne created the page of puzzles for the "Fun" section of the Sunday edition of the New York World. For the December 21, 1913, edition, he introduced a puzzle with a diamond shape and a hollow center, with the letters F-U ...

  5. Crossword - Wikipedia

    en.wikipedia.org/wiki/Crossword

    Crossword-like puzzles, for example Double Diamond Puzzles, appeared in the magazine St. Nicholas, published since 1873. [31] Another crossword puzzle appeared on September 14, 1890, in the Italian magazine Il Secolo Illustrato della Domenica. It was designed by Giuseppe Airoldi and titled "Per passare il tempo" ("To pass the time"). Airoldi's ...

  6. Sacsayhuamán - Wikipedia

    en.wikipedia.org/wiki/Sacsayhuamán

    ' fortress of the royal falcon or hawk ') [1] [2] [3] is a citadel on the northern outskirts of the city of Cusco, Peru, the historic capital of the Inca Empire. The site is at an altitude of 3,701 metres (12,142 ft). The complex was built by the Incas in the 15th century, particularly under Sapa Inca Pachacuti and his successors. [4]

  7. Mathematics of the Incas - Wikipedia

    en.wikipedia.org/wiki/Mathematics_of_the_Incas

    Quipukamayuq with his quipu and a yupana, the main instruments used by the Incas in mathematics. The mathematics of the Incas (or of the Tawantinsuyu) was the set of numerical and geometric knowledge and instruments developed and used in the nation of the Incas before the arrival of the Spaniards. It can be mainly characterized by its ...

  8. Quipu - Wikipedia

    en.wikipedia.org/wiki/Quipu

    The first undisputed evidence of quipu technology dates back to the Middle Horizon (c. 600–1000 CE), [47] with these early quipus being used by the Wari Empire. Differing slightly from their Inca successors, extant Wari quipu specimens tend to be smaller, have brightly colored thread wrapped cords, and its own system of knots which scholars ...

  9. Inca rope bridge - Wikipedia

    en.wikipedia.org/wiki/Inca_rope_bridge

    Made of grass, the last remaining Inca rope bridge, reconstructed every June, is the Q'iswa Chaka (Quechua for "rope bridge"), spanning the Apurimac River near Huinchiri, in Canas Province, Quehue District, Peru. Even though there is a modern bridge nearby, the residents of the region keep the ancient tradition and skills alive by renewing the ...

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