Cold as Ice. Discovery Museums. 177 Main Street. Acton. 10:00 a.m. to 1:00 p.m. Make chilly discoveries when you put salt, coins, and food coloring on a 300-pound block of ice. Learn about the unique characteristics of this solid state of water as you experiment with ice cubes and play a creative ice cube board game! Outdoor program, weather permitting. Free with admission. 978-264-4200. www.discoverymuseums.org