Explore your curiosity at this year’s North Bay Science Discovery Day. A free one-day public science festival designed to spark children’s sense of wonder, interest, and passion for science, technology, engineering, and mathematics (STEM). With over 70 organizations and 100 hands-on interactive exhibits, there is something intriguing for everyone. Investigate rockets and robots, beehives and sharks, catapults and animation, hearts and animals, and more. Meet and talk to professional scientists and engineers. What an opportunity for all those who have their eyes on the future. Rain or shine. March 9. 10 a.m.–4 p.m. Admission and parking are free. Santa Rosa Fairgrounds. 1350 Bennett Valley Rd., Santa Rosa. northbayscience.org.