Discover the secrets of the third dimension and find out how 3D optics really works. With Secret Codes, little agents will learn the basics of cryptology by mirror writing and encrypting secret messages. Becoming a mineralogist was never so much fun! Mineralogy comes to life via a host of mineral- and crystal-growing experiments. Floating paper clips, the inner workings of a compass and other fascinating aspects of the invisible force will attract explorers to the world of magnetism.