Learning Resources Primary Science Archimedes Screw (Set of 4). Introduce the concept of cause and effect the hands-on way with these sturdy, child-friendly Archimedes Screws! Screws can be used with water, soil, sand and other small solids. Encourages observation skills as young learners watch liquids and small solids defy gravity and work their way up the screw instead of down! Ideally sized for little hands. Each screw measures 28cm L. Suitable for ages 5+.