19. Can you move your upper jaw?
20. Are people naturally right or left-handed?
21. Why can so few persons move their ears by the muscles?
22. Is the blacksmith's right arm healthier than the left?
23. Boys often, though foolishly, thrust a pin into the flesh just above the knee. Why is it not painful?
24. Will ten minutes' practice in a gymnasium answer for a day's exercise?
25. Why would an elastic tendon be unfitted to transmit the motion of a muscle?
26. When one is struck violently on the head, why does he instantly fall?
27. What is the cause of the difference between light and dark meat in a fowl?