Photo Credits



Barack Obama Pete Souza, White House photographer; Michelle Obama Joyce N. Boghosian, White House photographer; one hundred dollar bills © Royalty-Free/Corbis; girls watching movie Fuse/Getty Images; trumpeter Jupiterimages/Getty Images; State Capitol in Little Rock, Arkansas © Robert W. Ginn/Alamy; slave ship Images; girl using computer in library Jupiterimages/Getty Images; male students in Dakar, Senegal, Africa Sam Dudgeon/HRW; Africa map ImageClub/Getty Images; handshake Photodisc/Getty Images; crowd with vote placards HRW; White House Digital Vision/Getty Images; Harriet Tubman Images.


Abraham Lincoln © Alamy; State Capitol in Little Rock, Arkansas © Robert W. Ginn/Alamy; reading newspapers Stockbyte/Alamy; golf Stockbyte/Getty Images; Martin Luther King National Archives (NARA); confidential file © Royalty-Free/Corbis; DNA Helix model Photodisc/Getty Images; microphone Getty Images; man reading newspaper Brand X Pictures/Jupiterimages/Getty Images; swimming Photodisc/Getty Images; syringe © Royalty-Free/Corbis; oil rig © Royalty-Free/Corbis; gavel Jupiterimages/Getty Image; helicopter and troops Army photo by Sgt. Cody Harding; woman holding confidential file Photodisc/Getty Images; fugitive slaves Jupiterimages/Getty Images; telephone Comstock/Getty Images; real estate documents Photodisc/Getty Images; Hudson River valley Digital Vision/Getty Images; troop with machine gun Air Force photo by Staff Sgt. Steven R. Doty; male students in Dakar, Senegal, Africa Sam Dudgeon/HRW; Civil War surgeons in front of tent Library of Congress, Prints and Photographs Division (LC-DIG-cwpb-03662); pirate Liquidlibrary/Jupiterimages/Getty Images; New York City Digital Vision/Getty Images; earth Digital Vision/Getty Images; Supreme Court Photodisc/Getty Images; cowboy Comstock/Getty Images; Russian flag Comstock/Getty Images; one hundred dollar bills © Royalty-Free/Corbis; scales of justice Comstock/Getty Images; traffic Comstock/Getty; female pilots U.S. Air Force photo; Smithsonian Institution © Royalty-Free/Corbis.


Citizenship oath Photodisc/Getty Images; vote here sign Photodisc/Getty Images; doctors Comstock/Getty Images; international flags Comstock Images/Getty Images; hand and mouse Comstock/Jupiterimages/Getty Images; Supreme Court Photodisc/Getty Images; examining x-rays Photodisc/Getty Images; airport security Victoria Smith/HRW; U.S. Capitol Brand X Pictures/Age Fotostock; inaugural parade Photograph in the Carol M. Highsmith Archive, Library of Congress, Prints and Photographs Division (LC-DIG-highsm-03843); airport ticketing Victoria Smith/HRW; stock prices © Royalty-Free/Corbis.


Bank teller counting money ©Royalty-Free/Corbis; bundles of bills ©Royalty-Free/Corbis; produce market Cindy Bland Verheyden/HMH; woman and boy at computer ©Ryan McVay/Digital Vision/Getty Images; people in car with bouquet and CD © Liquidlibrary/Jupiterimages/Getty Images; woman at store checkout ©Ryan McVay/Digital Vision/Getty Images; stock market chart ©Royalty-Free/Corbis; international flags ©Comstock Images/Getty Images; stock board ©Comstock Images/Getty Images; man reviewing business section ©Royalty-Free/Corbis; euro banknotes ©Comstock/Getty Images; foreclosed home for sale ©Ariel Skelley/Corbis; young woman at laptop ©Tim Pannell/Corbis; docked cargo ship ©Comstock Images/Getty Images; classifieds and unemployment insurance booklet ©Comstock/Getty Images; fifty dollar bills ©Royalty-Free/Corbis; line graph ©Tim Hall/Photodisc/Getty Images; customer paying at restaurant Scott Rosen/Bill Smith Studio/HMH; quarters on stock report ©Royalty-Free/Corbis; potatoes ©Liquidlibrary/Jupiterimages/Getty Images; computer mouse on bills ©Comstock Images/Getty Images; savings bonds ©Comstock/Jupiterimages/Getty Images; wallet with money ©Eyewire/Getty Images; handshake ©PhotoLink/Photodisc/Getty Images; pumping gas ©Jack Star/PhotoLink/Photodisc/Getty Images; homeless man in city ©Jupiterimages/Getty Images; workers in hard hats ©Dynamic Graphics/Getty Images.


Students doing homework ©Creatas/Jupiterimages/Getty Images; psychologist with inkblot ©Royalty-Free/Corbis; boy sleeping on book ©Dynamic Graphics/Jupiterimages/Getty Images; brain light diagram ©Chad Baker/Photodisc/Getty Images; bundles of bills ©Royalty-Free/Corbis; man lifting dumbbell ©JGI/Blend Images/Corbis; boy and girl playing video games ©Jupiterimages/Getty Images; binary code superimposed on face ©Chad Baker/Ryan McVay/Digital Vision/Getty Images; laughing group ©Jacobs Stock Photography/Digital Vision/Getty Images; twin boys HMH.


Bacteria ©Enigma/Alamy; family laughing ©Digital Vision/Getty Images; teacher pointing ©Doug Menuez/Photodisc/Getty Images; young woman at computer ©Liquidlibrary/Jupiterimages/Getty Images; text message ©Nick Koudis/Digital Vision/Getty Images.


Mountain range in Tibet ©Jupiterimages/Getty Images; bundles of bills ©Royalty-Free/Corbis; Giza pyramids ©Brand X Pictures/Getty Images; Machu Picchu Don Couch/HMH; Amazon jungle ©Adalberto Rios Lanz/Sexto Sol/Photodisc/Getty Images; chest with coins ©Brand X Pictures/Getty Images; Amsterdam ©Neil Beer/Photodisc/Getty Images; Varanasi, India ©Aivar Mikko/Alamy; Copenhagen canal © Royalty-Free/Corbis; sarcophagus of Tutankhamen © Images; Dead Sea scroll Library of Congress, Prints and Photographs Division, [LC-DIG-matpc-22899]; euro banknotes ©Comstock/Getty Images; Archaeopteryx fossil skeleton ©Jason Edwards/National Geographic/Getty Images; Great Wall of China ©Digital Vision/Getty Images; earth ©Digital Vision/Getty Images; U.S. Army personnel with Afghans Photo by Sgt. Russell Gilchrest, Courtesy of the U.S. Army; The Western Wall, Jerusalem ©Jupiterimages/Getty Images; Kosovo flag HMH; procession frieze ©Cal. State California History Collection/Stockbyte/Getty Images; metal globe ©The Studio Dog/Photodisc/Getty Images; El Castillo ©Goodshoot/Jupiterimages/Getty Images; headphones on mixing board ©PhotoLink/Photodisc/Getty Images; Ottoman Empire map HMH; Pakistan flag ©Comstock/Getty Images; Havasupai indian pottery ©Saulius T. Kondrotas/Alamy; conceptual rendering of the big bang ©PASIEKA/SPL/Getty Images; tunnel construction ©Royalty-Free/Corbis; Stonehenge ©Grant Faint/Photographer’s Choice RF/Getty Images; injection ©Royalty-Free/Corbis; scuba diver ©Stockbyte/Getty Images; Muslims praying HMH; airplane ©F. Schussler/PhotoLink/Photodisc/Getty Images; castle ruins ©Andrew Ward/Life File/Photodisc/Getty Images.

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