Fleets of tiny translucent umbrellas, each about the size of a lentil, waft through the waters of the Mediterranean Sea. These miniature jellyfish, known as Turritopsis dohrnii, wave and grasp with ...

For more than 500 million years – well before dinosaurs ever thought of existing – jellyfish have floated through the world’s oceans. Today, 2,000 species of jellyfish have been discovered around the ...