Subscribe to CNN’s Wonder Theory newsletter to stay up-to-date with awe-inspiring news about scientific breakthroughs and the wonders of the universe. Scientists have unveiled a surprising addition to the ocean’s mystifying midnight zone: a glowing creature they've dubbed the “mystery mollusk.” This new species—an apple-sized sea slug named Bathydevius caudactylus—is unlike any other the Monterey Bay Aquarium Research Institute (MBARI) has encountered. Its unique characteristics set it