
 Archimedes's method 
  It provides a glimpse into the thinking which led Archimedes to many of his famous results, including the determination of the area of a parabola, the area and volume of a sphere, and the volume of an ellipsoid. 
  Apparently, Archimedes, whose understanding of such matters as levers and centers of gravity was particularly insightful, was able to envision ways to "weigh" various geometric figures against one another so as to successfully compare their areas or volumes. 
  P.S. The Archimedes Palimpsest was sold on October 29, 1998 at Christie's to "an unidentified American Collector" for $2,000,000. 
 www.cuttheknot.org /pythagoras/Archimedes.shtml (747 words) 
