"Jellies."

Sea jellies, those mesmerizing gelatinous creatures of the deep, do more than sting the occasional unsuspecting beachgoer. The Shedd's special exhibit dives deep into their mysterious world, looking at how their simple bodies have helped them survive for millions of years, how they're able to munch enough food to double their body weight daily, and how some of them hunt using paralyzing stinging cells. Ouch.