Do You Know?

1. The lunar transfer of Chandrayaan-1 was done with an elliptic orbit which touches an orbit of Earth as well as an orbit of the Moon. Who thought of this idea? Has it been done before by other spacecraft?
2. What is reverse swing bowling? Who thought of this idea?
3. What is a prime number? Is there any way of finding out how many primes there are between 1 and 1,000? Or 1 and 10,000?
4. Many biologists use Petri dishes in their experiments. What are they and why are they used?
5. A volcanic eruption requires a tremendous amount of energy. Where does this energy come from?