Marine scientist and educator Ellen Prager ’84 is the author of Sex, Drugs, and Sea Slime: The Oceans’ Oddest Creatures and Why They Matter, just published by University of Chicago Press. She introduces the reader to a variety of fascinating and often strange creatures that live in the depths of the ocean—from tiny but voracious arrow worms whose rapacious ways may lead to death by overeating, to the lobsters that battle rivals or seduce mates with their urine, to the sea’s masters of disguise, the octopuses. Prager examines the ways these sea inhabitants interact as predators, prey, or potential mates.…