From head to shoulders to knees to toes we all know the parts of our bodies, but do we all know what's inside our bodies? Melissa & Doug's Human Anatomy Floor Double-Sided Puzzle is a colorful and fun look into the world within our own bodies! This 100 piece jigsaw human body puzzle is double sided for two fun anatomy learning activities. Piece together the human skeletal system on one side, and then connect the human organ system on the other. A nearly life sized puzzle with durable pieces that are 20% thicker than other floor puzzles, the Human Anatomy Floor Double-Sided Puzzle is one of Educational Toys Planet's top learning puzzles for grade school kids. A science toy that will not only educate, but will keep your child entertained for years to come! This 4 feet tall learning puzzle is a great addition to the science toys collection in the classroom or your play room.