National Geographic, Volume 218, Issue 2

acres animals appeared Armenia Azerbaijan Bahamas Baku blood blood sugar blue holes body bones cars Caucasus cave century closed comes coupon diabetes diabetic ketoacidosis dive divers doctor early Earth emeralds environment feet forest fossil Freight Georgia Gingerich glucose Gold guards HARBOR heart human important Indian insulin issue ITALY Kakuk Kaziranga Lake land Lantus later legs limited LIPITOR living look lower MAPS Michigan miles million mountains move National Geographic National Park native natural never OCEAN offer once Original park PHOTO Photographs powerful PRICE railroad region remains Reservation restore rhino risk river SAVE says side Silk Road skull South species Stauer studied tail tigers Tools trees tribe Turkey University Valid Visit watch whales