Get students interested in STEM with these activities. The challenges aren't all the same and are easy to complete. Each challenge card has two sides, one with the challenge itself and list of materials they need, and the other helps extended learning as well as including hints and explanations of the challenge and how it relates to STEM learning. Great for science centers! Includes 30 challenge cards. 10 each for: physical science, life science, earth & space science. Includes a durable storage container. Paper. (30 pcs. per unit) 6" x 8"