History, Travel, Arts, Science, People, Places | Smithsonian Magazine - Waterfox. Get AlterNet In Your Mailbox. Flags of Every Country. Magnitudes, unidades y símbolos. Football, Physics, and Symmetry. The Histomap. Four Thousand Years Of World History. Relative Power Of Contemporary States, Nations And Empires. Copyright by John B. Sparks. Published by Histomap, Inc. Chicago, Ill. Printed and distributed in the U.S.A. by Rand McNally & Co., Chicago, Il. Brain Pickings. Discovery Channel : Science, History, Space, Tech, Sharks, News! Wolfram|Alpha: Computational Knowledge Engine. The free encyclopedia.