http://www.learner.org/interactives/geometry/platonic.html
AS UNDERGRADS AT HOWARD, IN THE EARLY 1970'S, WE USED TO GRIP OUR FIST INTO A SALUTE, AND REPLY "SOLID," WHENEVER WE AGREED WITH AN ASSERTION. LITTLE DID WE KNOW THAT, IN DOING SO, WE WERE ALSO INVOKING FIVE ACTUAL GEOMETRIC SOLIDS PROVEN BY EUCLID'S "ELEMENTS," MATHEMATICALLY, THAT PREDATE EUCLID AND GREECE BY AT LEAST A THOUSAND YEARS THAT ARE ROOTED IN, AND THAT ARISE FROM, NUBIAN/KEMETIC (ANCIENT EGYPTIAN) CULTURE.