Do You Know?

1. Why do memories of vivid dreams disappear soon after waking up?
2. Are strange science theories like Quantum Mechanics actually useful in everyday life? Should scientists waste public money on such research simply for their curiosity?
3. I have heard that watching TV can be bad for children. But can't regular physical exercise counteract any negative effects of TV watching?
4. Can people actually die because of hot weather as in a "heat wave"?
5. Is it possible for a muscle to turn into a bone?
6. I read of a cricketer developing a "stress fracture". What is it, and how does it develop?