Do You Know?

1. The Voyager 1 and 2 spacecraft went past Jupiter, Saturn, Uranus and Neptune. Has no one ever though of visiting Pluto?
2. Which animals sweat?
3. How much damage can a rupee coin dropped from some height do?
4. What chemical leaks from batteries?
5. When ice falls as hail it is hard, whereas snow is soft. Why?
6. Was Einstein's brain different to mine?