National Geographic

112‘IT’S HARD TO PIN DOWN THEEXACT SIZE OF THE GLOBALBLACK MARKET FOR BUTTER-FLIES TODAY, BUT ESTIMATESRANGE UP TO HUNDREDS OFMILLIONS OF DOLLARS A YEAR.’AUGUST 2018Science of Sleep .........P. 4 0Poisoning Africa ..........P. 7 8Basque Whalers .........P. 1 0 2Butterfly Catchers ......P. 1 1 2Yemen Health Crisis ..P. 1 3 4NATIONAL GEOGRAPHICFEATURESPHOTO: EVGENIA ARBUGAEVA