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DIGITAL CREDITS | COVER: PAKHNYUSHCHYY/ISTOCK/GETTY IMAGES. TOC: (BACKGROUND) OLAF HERSCHBACH/EYEEM/GETTY IMAGES; (LIONFISH)BABELFILM/ISTOCK/GETTY IMAGES; (BICYCLES) PROSTOCK-STUDIO/SHUTTERSTOCK; (FORD’S THEATRE) LIBRARY OF CONGRESS. LIONS ON THE LOOSE: (LIONFISH) BABELFILM/ISTOCK/GETTY IMAGES; (WATER BACKGROUND VIDEO) RASPIRATOR CREATAS VIDEO +/GETTY IMAGES PLUS; (LIONFISH) CIGDEM-SEAN COOPER/ALAMY STOCK PHOTO; (SWIMMING LIONFISH VIDEO) DAVID HANNAN/IMAGE BANK FILM/GETTY IMAGES; (DIVERS, REEF AND LIONFISH) KEN KIEFER 2/IMAGE SOURCE/SUPERSTOCK; (EATING LIONFISH VIDEO) ROBERTHARDING/IMAGE BANK FILM/GETTY IMAGES; (LIONFISH IN MANGROVE) ETHAN DANIELS/STOCKTREK IMAGES/ GETTY IMAGES; (CLEANER FISH) DOUG PERRINE/PHOTOLIBRARY/GETTY IMAGES; (LIONFISH GROUP) © OCEANPHOTO/FLPA/MINDEN PICTURES; (SINGLE LIONFISH) CSP_AMWU2008/FOTOSEARCH LBRF/AGE FOTOSTOCK; (LIONFISH SPINES) ZUMA PRESS INC/ALAMY STOCK PHOTO; (LIONFISH AND REEF) REINHARD DIRSCHERL/AGE FOTOSTOCK/SUPERSTOCK; (DICER WITH SPEAR)CULTURA CREATIVE (RF) /ALAMY STOCK PHOTO; (CHIEFS) ZUMA PRESS INC/ALAMY STOCK PHOTO; (LIONFISH PHOTO AND VIDEO) STEVE GITTINGS. ROUND AND ROUND WITH WHEELS AND AXLES: PROSTOCK-STUDIO/SHUTTERSTOCK; (BACKGROUND) STUDIOSTOKS/SHUTTERSTOCK; (BOOKS) MALCHEV/SHUTTERSTOCK; (WOMAN WITH CART) DNY59/E+/GETTY IMAGES; (TRAILER) STEVANOVICIGOR/ISTOCK/GETTY IMAGES PLUS; (BICYCLE) IAKOVENKO/ISTOCK/GETTY IMAGES; (INSET) SHCHR/ISTOCK/GETTY IMAGES PLUS; (WRENCH) MACIDA/E+/GETTY IMAGES; (WRENCH VIDEO) BLACKLIGHT FILMS/IMAGE BANK FILM/GETTY IMAGES; (SCREWDRIVER) PHOTODISC; (FERRIS WHEEL VIDEO) BSPC/CREATAS VIDOE/GETTY IMAGES; (GETTING IN GEAR ALL) REBECCA HALE/NG STAFF. SAVING HISTORY: (FORD’S THEATRE) LIBRARY OF CONGRESS; (LINCOLN) RGB VENTURES/SUPERSTOCK/ALAMY STOCK PHOTO; (BOOT, COMPASS, DIARY & TOOTHBRUSH) LIBRARY OF CONGRESS; (BOOTH & POWELL) ARCHIVE PICS/ALAMY STOCK PHOTO; (THEATER BOOTH & LOBBY, PETERSEN BEDROOM) LIBRARY OF CONGRESS; (CURATOR AND LETTER) REBECCA HALE/NG STAFF; (LINCOLN JACKET) GIFT OF MRS. WILLIAM HUNT/NATIONAL MUSEUM OF AMERICAN HISTORY. EXPLORER CLASSROOM: REBECCA HALE/NG STAFF. ENDING PHOTO: LAURA DINRATHS/SHUTTERSTOCK.