The Canadian company Roylco started out in the sixties making educational supplies like chalkboard erasers, but now they cook up some of the best stuff for kids -- or adults -- anywhere. The eye-catcher at this year’s Toy Fair booth was the set of human skeleton X-rays (the broken bone was a close runner-up). So put on your white lab coats and hold these up to a window or light-box for a closer examination. Comes with a teacher guide on artwork and radiography. No medical degree required. $26.95 at amazon.