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(ISSN 1541-3357) is published seven times during the school year—September, October, November–December, January–February, March, April, May—by National Geographic Society, 1145 17th Street NW, Washington, D.C. 20036. Postmaster: Please send address changes to Attn: Explorer Magazine, National Geographic Society, PO Box 291875, Kettering, OH 45429. Periodical postage paid at Washington, D.C., and additional mailing offices.
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DIGITAL CREDITS | COVER: JEN WENTWORTH. TOC: (BACKGROUND) BORCHEE/ISTOCK/GETTY IMAGES PLUS; (FOREST & ELK) CHASE DEKKER WILD-LIFE IMAGES/MOMENT/GETTY IMAGES; (MOUNT VERNON) WIM.WISKERKE/ALAMY STOCK PHOTO; (ANDREJ GAJIĆ ) FERNANDO CAAMANO/NATIONAL GEOGRAPHIC. WHO TAKES CARE OF OUR FORESTS: (FOREST & ELK) CHASE DEKKER WILD-LIFE IMAGES/MOMENT/GETTY IMAGES; (ALL ILLUSTRATIONS) ELENA PALETSKAYA/SHUTTERSTOCK; (KEN PRICE) ANGIE PRICE; (COELI HOOVER) COELI HOOVER; (MAGEN DUFURRENA) JEN WENTWORTH; (CADY LANCASTER) CADY LANCASTER; (DARREN SLEEP) OWEN SLATER PHOTOGRAPHY; (VIDEO) COURTESY OF SFI; (ASHLEY COBLE) ADAM COBLE; (ANDREE MORNEAULT) LIZ COBB/SILVICULTURE FORESTER/OTTAWA VALLEY FOREST; (KIM KENNEDY) KIM KENNEDY; (KENDALL CONROY) IAN MORRELL; (VIDEO) MICHIGAN DEPARTMENT OF NATURAL RESOURCES. DIGGING UP HISTORY: (MOUNT VERNON BUILDING) WIM.WISKERKE/ALAMY STOCK PHOTO; © JEAN SHAPIRO CANTU; (MAP BACKGROUND) EVERETT HISTORICAL/SHUTTERSTOCK; (UPPER GARDEN VEGETABLES) PAT & CHUCK BLACKLEY/ALAMY STOCK PHOTO; (BOXWOODS) DAVID STUCKEL/ALAMY STOCK PHOTO; (LOWER GARDEN AND GARDEN MAP) GEORGE WASHINGTON’S MOUNT VERNON; (BLUE FLOWER DRAWING) ARXICHTU4KI/ISTOCK/GETTY IMAGES PLUS; (STRAWBERRY DRAWING) EDWIN DALTON SMITH/PRIVATE COLLECTION/BRIDGEMAN IMAGES; (EXCAVATION) GEORGE WASHINGTON’S MOUNT VERNON; (BOWLING GREEN) IMAGE PROFESSIONALS GMBH/ALAMY STOCK PHOTO; (VIDEO) SMITHSONIAN/GETTY IMAGES. OUT OF THE WATER, INTO THE LAB: (ANDREJ HOLDING SHARK JAW) FERNANDO CAAMANO/NATIONAL GEOGRAPHIC; (SMOOTH-HOUND SHARK SWIMMING) © DOUG PERRINE/NPL/MINDEN PICTURES; (ANDREJ INSET & ANDREJ EXAMINING UNBORN SHARK) ADLA KAHRIĆ/SHARKLAB ADRIA; (SHARK VIDEO) ROBERTHARDING/VERVE/GETTY IMAGES; (MAP) MAPPING SPECIALISTS, LTD; (ANDREJ & UNBORN SHARKS) ADLA KAHRIĆ/SHARKLAB ADRIA; (ANDREJ IN LAB) SHARKLAB ADRIA; (HAND HOLDING SHARK HEAD) ANDREJ A. GAJIĆ/SHARKLAB ADRIA; (ANDREJ UNDERWATER) OGUZ CAVDIR; (ANDREJ & JELLYFISH) ADLA KAHRIĆ/SHARKLAB ADRIA; (HAND & SHARK EGG) FERNANDO CAAMANO/NATIONAL GEOGRAPHIC.MEET ANDREJ GAJIĆ: FERNANDO CAAMANO/NATIONAL GEOGRAPHIC. THE END PHOTO: MARTIN PUDDY/THE IMAGE BANK/GETTY IMAGES PLUS.