Imagine: You’re sitting on the beach of a tropical island in the middle of paradise. Your beach chair is painted white, no splinters, and your feet are in the sparkling blue sea. Gulls cry overhead, and hermit crabs make tracks across the white expanse of sand. Behind you, palm trees wave their branches in the slight breeze and tropical birds serenade your perfect evening. You decide it’s the perfect moment to read your new adventure travel novel. Reaching into your bag, you pull out... what?