Effect of spaceflight on the human body of muscle fibre prominent in muscles also change. Slow twitch endurance fibres used to maintain posture are replaced by fast twitch rapidly contracting fibres that are insufficient for any heavy labour. Advances in research on exercise, hormone supplements and medication may help maintain muscle and body mass. Bone metabolism also changes. Normally, bone is laid down in the direction of mechanical stress. However, in a microgravity environment there is very little mechanical stress. This results in a loss of bone tissue approximately 1.5% per month especially from the lower vertebrae, hip and femur. Due to microgravity and the decreased load
The Amazing Bone The Amazing Bone The Amazing Bone is a 32-page picture book by William Steig from 1976. It was nominated for the Caldecott Medal in 1977; however, Leo & Diane Dillon's "" won, so "The Amazing Bone" only received the Caldecott Honor Award. It was the first of Steig's few books in which the main character is a female. The story is about how Pearl the pig is walking home from school, and finds a magic bone on the ground, which has the ability to imitate any sound and speak in any language (It samples Spanish, Polish and German for her).