Jennifer Thermes/Getty Images (Launchpad) 
Library of Congress (Launchpad) 
Library of Congress (Biography) NASA (Launchpad) Library of Congress (Launchpad) Jennifer Thermes/Getty Images (Field Trip) 
NASA (Field Trip) Library of Congress (Biography) (c) Digital Vision/PunchStock (Biography) Photodisc/Getty Images (Launchpad) Photodisc/Getty Images (Day in the Life) Martial Colomb/Getty Images (Biography) Nick Rowe/Getty Images (Launchpad) Library of Congress (Launchpad) Library of Congress (Biography) National Archives & Records Administration (Biography)
Robert Glusic/Getty Images (Launchpad) Robert Glusic/Getty Images (Field Trip) Robert Glusic/Getty Images (Field Trip) Geostock/Getty Images (Launchpad) Library of Congress (Launchpad) Geostock/Getty Images (Day in the Life) Library of Congress (Biography) Library of Congress (Launchpad) Getty Images (Launchpad) Getty Images (Day in the Life) Library of Congress (Biography) Library of Congress (Biography)
Library of Congress (Quiz) Library of Congress (Quiz) Photodisc/Getty Images (Quiz) Photodisc/Getty Images (Quiz) Library of Congress (Launchpad) Library of Congress (Field Trip) Photodisc/Getty Images (Field Trip) C Squared Studios/Getty Images (Launchpad) Library of Congress (Launchpad) C Squared Studios/Getty Images (Field Trip) Library of Congress (Biography) PhotoLink/Getty Images (Biography) Library of Congress (Launchpad) Fototeca Storica Nazionale/Getty Images (Launchpad) Library of Congress (Biography) Fototeca Storica Nazionale/Getty Images (Day in the Life) 
The McGraw-Hill Companies, Inc./Ken Cavanagh (Quiz) 
United States Postal Service (Launchpad) PhotoLink/Getty Images (Biography) PhotoLink/Getty Images (Biography) United States Postal Service (A Day in the Life) Library of Congress (Quiz) Library of Congress (Launchpad) Wetzel and Company (Launchpad) Library of Congress (Biography) Wetzel and Company (Field Trip) The McGraw-Hill Companies, Inc./Jill Braaten, photographer (Launchpad) Library of Congress (Launchpad) The McGraw-Hill Companies, Inc./Jill Braaten, photographer (A Day in the Life) Library of Congress (Biography) United States Postal Service (Launchpad) Photodisc/Getty Images (Launchpad) Photodisc/Getty Images (Field Trip) United States Postal Service (Biography) C Squared Studios/Getty Images (Biography) United States Postal Service (Quiz) United States Postal Service (Launchpad) United States Postal Service (A Day in the Life) Library of Congress (Quiz) 
D. Falconer/PhotoLink/Getty Images (Launchpad) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Launchpad) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Launchpad) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Big Idea Activity)
D. Falconer/PhotoLink/Getty Images (Field Trip) Robert Glusic/Getty Images (Field Trip) 
The McGraw-Hill Companies, Inc./Ken Karp, photographer (Local Connection) Steve Cole/Getty Images (Launchpad) C Squared Studios/Getty Images (Launchpad) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Launchpad) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Launchpad) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Local Connection) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Local Connection) Steve Cole/Getty Images (Day in the Life) C Squared Studios/Getty Images (Biography) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Launchpad) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Launchpad) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Big Idea Activity) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Local Connection) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Local Connection) PhotoLink/Getty Images (Field Trip) David Buffington/Getty Images (Launchpad) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Launchpad) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Launchpad) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Local Connection) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Local Connection) F. Schussler/PhotoLink/Getty Images (Biography) David Buffington/Getty Images (Day in the Life) Lawrence Lawry/Getty Images (Launchpad) The McGraw-Hill Companies, Inc./Jill Braaten, photographer (Launchpad) Scenics of America/PhotoLink/Getty Images (Launchpad) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Launchpad) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Launchpad) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Local Connection) The McGraw-Hill Companies, Inc./Ken Karp, photographer (Local Connection) Lawrence Lawry/Getty Images (Biography) Scenics of America/PhotoLink/Getty Images (Field Trip) The McGraw-Hill Companies, Inc./Jill Braaten, photographer (Field Trip) Library of Congress (Quiz) 
Library of Congress (Launchpad) (c) Photodisc (Launchpad) The McGraw-Hill Companies/John A. Karachewski, photographer (Launchpad) Library of Congress (Biography) Library of Congress (Biography) (c) Photodisc (Biography) The McGraw-Hill Companies/John A. Karachewski, photographer (Field Trip) The McGraw-Hill Companies/John A. Karachewski, photographer (Field Trip) The McGraw-Hill Companies/Ken Karp, photographer (Big Idea Activity) Library of Congress (Quiz) The McGraw-Hill Companies/Susan Moore, Artist (Launchpad) United States Postal Service (Launchpad) The McGraw-Hill Companies/Susan Moore, Artist (Day in the Life) United States Postal Service (Biography) Library of Congress (Big Idea Activity) The McGraw-Hill Companies/Susan Moore, Artist (Quiz) Library of Congress (Launchpad) United States Postal Service (Launchpad) PhotoLink/Getty Images / PhotoLink/Getty Images (Launchpad) Photodisc Collection/Getty Images (Launchpad) The McGraw-Hill Companies/Ken Karp, photographer (Big Idea Activity) Library of Congress (Day in the Life) United States Postal Service (Biography) C Squared Studios/Getty Images (Biography) PhotoLink/Getty Images / PhotoLink/Getty Images (Biography) Photodisc Collection/Getty Images (Biography) United States Postal Service (Quiz) PhotoLink/Getty Images (Launchpad) (c) Brand X Pictures/PunchStock (Launchpad) The McGraw-Hill Companies/Ken Karp, photographer (Big Idea Activity) United States Postal Service (Field Trip) Photodisc/Getty Images (Field Trip) Library of Congress (Biography) PhotoLink/Getty Images (Biography) Library of Congress (Biography) F. Schussler/PhotoLink/Getty Images (Launchpad) United States Postal Service (Launchpad) Skip Nall/Getty Images (Launchpad) F. Schussler/PhotoLink/Getty Images (Biography) United States Postal Service (Biography) Skip Nall/Getty Images (Field Trip) 
J.Luke/PhotoLink/Getty Images (Biography) S. Alden/PhotoLink/Getty Images (Launchpad) United States Postal Service (Launchpad) The McGraw-Hill Companies/Richard Hutchings, photographer (Big Idea Activity) United States Postal Service (A Day in the Life) S. Alden/PhotoLink/Getty Images (Biography) Ryan McVay/Getty Images (Biography) Ryan McVay/Getty Images (Launchpad) Wetzel and Company (Launchpad) Wetzel and Company (Field Trip) Jules Frazier/Getty Images (Launchpad) C Squared Studios/Getty Images (Launchpad) Harnett/Hanzon/Getty Images (Launchpad) Library of Congress (Launchpad) Jules Frazier/Getty Images (A Day in the Life) C Squared Studios/Getty Images (Biography) Library of Congress (Biography) Harnett/Hanzon/Getty Images (Biography) Library of Congress (A Day in the Life) R. Morley/PhotoLink/Getty Images (Big Idea Activity) Library of Congress (Launchpad) Library of Congress (Launchpad) The McGraw-Hill Companies/Richard Hutchings, photographer (Big Idea Activity) Library of Congress (Biography) C Squared Studios/Getty Images (Biography) Library of Congress (Biography) Library of Congress (Field Trip) (c) Digital Vision/PunchStock (Launchpad) United States Postal Service (Launchpad) Ryan McVay/Getty Images (Launchpad) The McGraw-Hill Companies/Richard Hutchings, photographer (Big Idea Activity) Ryan McVay/Getty Images (Biography) Library of Congress (Biography) United States Postal Service (A Day in the Life) Wetzel and Company (Launchpad) PhotoLink/Getty Images (Field Trip) Wetzel and Company (Field Trip) Library of Congress (Launchpad) PhotoLink/Getty Images (Launchpad) Jules Frazier/Getty Images/C Squared Studios/Getty Images (Launchpad) Library of Congress (Biography) PhotoLink/Getty Images (Biography) Jules Frazier/Getty Images/C Squared Studios/Getty Images (A Day in the Life) Library of Congress (Quiz) Library of Congress (Quiz) 
Neil Beer/Getty Images (Field Trip) Adam Crowley/Getty Images (Field Trip) Digital Vision Ltd./Getty Images (Launchpad) Nick Koudis/Getty Images (Launchpad) Nick Koudis/Getty Images (Biography) Photodisc/Getty Images, C. Sherburne/PhotoLink/Getty Images (Launchpad) (c) Brand X Pictures/PunchStock (Launchpad) Vote Photography/VStock/Alamy Images (Launchpad) Photodisc/Getty Images, C. Sherburne/PhotoLink/Getty Images (Biography) Vote Photography/VStock/Alamy Images (A Day in the Life) NASA (Big Idea Activity) Glen Allison/Getty Images (Launchpad) Jennifer Thermes/Getty Images (Biography) Annie Reynolds/PhotoLink/Getty Images (Field Trip) Glen Allison/Getty Images (Field Trip) Alan and Sandy Carey/Getty Images (Launchpad) S. Meltzer/PhotoLink/Getty Images (Launchpad) Alan and Sandy Carey/Getty Images (A Day in the Life) S. Meltzer/PhotoLink/Getty Images (Biography) Neil Beer/Getty Images (Biography) Neil Beer/Getty Images (Launchpad) John A. Rizzo/Getty Images (Launchpad) Emma Lee/Life File/Getty Images (Biography) Neil Beer/Getty Images (Field Trip) 
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