Ever wonder what it's like to be a geologist? Or maybe a paleontologist? Or a sound engineer, or a wildlife biologist? Explore all of these science-based professions and more during the festival's "Be a Scientist!" day on April 22. Experts at 21 locations will chat about their jobs. Families with little ones may want to check out Jefferson Health's "Be a Doctor! Teddy Bear Clinics" unfolding from 1 to 3 p.m. in Torresdale, Abington, and Washington Township, where children can experience what it's like to be a doctor or nurse with teddy bear in hand.