What is a catalyst? A puzzling question lands you in the wondrous world of chemical engineering. Have hands-on fun by producing your own cheese, and get to know Ryong Ryoo, who discovered a rock trapping water inside it can serve as catalyst in petrochemicals. The place to go to answer all your science-related questions - it's the One Stop Science Shop. Do-it-yourself experiments, a hologram entry phone, and fun stories about great scientists help visiting kids to understand some of the trickiest principles of science.