613 (T) Iain Masterton/Alamy Images; 625 (B) Hank Morgan/Photo Researchers, Inc.; 632 (B) George Steinmetz/Corbis; 641 (C) Museum of Science and Industry; 673 (T) Photolibrary Group, Inc.; 675 (T) Ron Chapple Stock; 684 (C) Koji Aoki/Afl o/Getty Images; 755 (T) Jim Sanborn; 767 (TR, TL) iStockphoto; 795 (TC) Wolfgang Spunbarg/PhotoEdit, Inc.; 819 (T) Ron Watts/Getty Images; 839 (CR) European Space Agency/Science Photo Library/Photo Researchers, Inc., (TCR) Steve Gorton/©DK Images; 840 (BL) David Zimmerman/Getty Images, (BR) Fnalphotos/Dreamstime LLC; 879 (TR) ART on FILE/Corbis; 881 (CR) Demetrio Carrasco/©DK Images; 895 (T) AFP PHOTO/Fabrice Coffrini/NewsCom; 913 (TR) age fotostock/SuperStock; 923 (C) mediacolor's/Alamy Images.