Wheel : (cart, solid wood) Mesopotamia, c.3800-3600 B.C.
Windmill : Persia, c.600.
World Wide Web : (developed while working at CERN) Tim Berners-Lee, England, 1989; (development of Mosaic browser makes WWW available for general use) Marc Andreeson, U.S.A., 1993.
X-ray Imaging : Wilhelm Conrad Rontgen, Germany, 1895.
Xerography : Chester Carlson, U.S.A., 1900.
Zero : India, c.600; (absolute zero temperature, cessation of all molecular energy) William Thompson, Lord Kelvin, England, 1848.
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