Curiosity Days are included in the price of admissions. From the Pacific Science Center web site, "Spend Earth Day Weekend at Curiosity Days: Dig In! to discuss scientific topics that affect our backyard and beyond. On April 21-23, join us for demonstrations, conversations, and a rich variety of hands-on interactive experiences about the earth, the environment, archaeology, and paleontology. Unearth important research taking place to protect our planet, and learn about the challenges facing our environment. Take a seat in our community living room to discuss, debate, and collaborate on the opportunities and challenges in which science and technology play roles."