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  • Hanaoka Seishu
    A stamp depicting the image of Hanaoka Seishu. Hanaoka Seishu (1760-1835), Japanese physician and pioneer of anesthetic surgery. Hanaok...
  • Modern Agriculture
    In the N and W United States the era of mechanized agriculture began with the invention of such farm machines as the reaper, the cultivator,...
  • Fluid Mechanics
    Fluid Mechanics, physical science dealing with the action of fluids at rest or in motion, and with applications and devices in engineering u...