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
What Is the Fastest Thing in the World? of which was good and some bad. The king set riddles to them: whoever guessed the riddles would get good land. The first riddle was what was the fastest thing in the world. The stupid brother's daughter told him what to say; his brother guessed a bird or a horse, and the stupid brother said the mind. The second riddle was what was the heaviest thing in the world; the clever brother guessed stone or iron, and the stupid brother repeated his daughter's answer: fire because no one could lift it. The third was what was the most important thing