1. A human hand has 22 degrees of freedom in total. Each finger has three joints that bend in different ways. The thumb was extra special because it can move in more directions to help grab and hold things such as my water bottle.

2. The most important movements are the ones that let your fingers and thumb bend , because thats how you grab and hold objects with your hands . The thumbs thing to move across the hand , is also really important because it helps you pick things up and use tools. Movements like spreading your fingers apart don't matter as much since they don't help you hold or grab things as much as your thumbs do.

3. If I were designing a robot hand, I would give it about 18 to 20 degrees of freedom . That would let it move almost like a real hand but still be easier to build and control. Each finger would bend and be able to grab things . The wrist would also move up, down, and side to side to help the hand reach and turn things. This would make the robot's hand useful and realistic without being too complicated.