A pull-trigger skeletal hand that moves like a real human hand, showing the inner bones for learning and fun. Snap the hand together and take hold of objects with flexing fingers and an opposable thumb. Experiments and comparisons offer a first-hand look at how we grip, grab, and grasp; includes 5 experiments and a 24-pg. full-color book. Handle allows for left- or right-handed use. For ages 9 yrs. and up.