Marvelous Molecules: The Secret of Life is the first ever hands-on exhibition exploring the shared chemistry of all living things. Hovering above the exhibit floor like a futuristic space station is a giant model of a glucose molecule magnified a quadrillion times (that's 10 followed by 15 zeroes!). This highly visible icon serves notice to visitors that they are about to enter a world whose size and scale is very different from their everyday experience. The exhibition's placement on the lower level of the Hall of Science serves to link, both physically and figuratively, two other popular exhibitions that explore subjects too small to see with the naked eye: Hidden Kingdoms -- The World of Microbes and The Realm of the Atom.