What to do on a chilly spring day? There was plenty of indoor fun to be had. At the Family Museum, dozens of children took part in the Egg Drop Kerplop! Kids built vessels that would protect their egg after it plunged from the museum's balcony. At the Bettendorf Public Library, book lovers could browse thousands of books, CDs, DVDs and other materials for sale at the Bettendorf Public Library Foundation's annual sale.