"Amazing things happen under the Earth's waters: the sea glows mysteriously at night, the smallest organisms (plankton) have the greatest power, and the fish, which seem so taciturn, communicate with each other loudly. In Blue Wonder, Frauke Bagusche, a German marine biologist, takes us on a fascinating dive beneath the ocean to recount her personal experiences with the world's smallest and largest creatures, explaining, for example, the origins of...