Designed by Theodore Gray, the creator of the Elements of the Periodic Table Poster, our beautiful 1000-piece puzzle is sure to delight puzzle aficionados of all ages. Can you remove the quarter from The Challenge Coin Puzzle? Easier said than done! Constellations Knowledge Cards each show a constellation on the front and the name and pertinent information on the back. Each Bones Playing Card, beautifully illustrated, presents one or two bones with their names in English, French and Spanish. The two Jokers act as quick indexes. The regular double deck of Periodic Table Playing Cards features one element per card. Included for each element is its name in English, French, and Spanish; its atomic number, mass, melting and boiling points; and relevant usages.