Purchase a ticket by signing up for one of the two time slots on March 31 from 10:00 a. m. – 12:00 p.m. or from 12:00 p. m. – 2:00 p.m.  Limited spots are available. The cost is $5 per child above age 5, or $15 for the family. Free admission for Walder Science members, adults and younger children. Adult supervision is required at all times.