Robots and Mud Pies π Preschool is the first Science, Technology, Engineering and Mathematics Education (STEM) focused preschool in the Richmond area. We offer a half day program for children ages 2 years old through 5 years old with a morning session (9:00-12:00) and an afternoon session (1:00-4:00). Our full day program goes from 8:30 to 4:30.