5 interesting facts about Mumbai

1. Second most populous city in the world.
2. Was built on seven islands including: Bombay, Parel, Mazagaon, Mahim, Colaba, Worli, and Little Colaba.
3. Some of the oldest catholic churches.
4. Has a tropical climate.
5. Schools are either private schools or municipal schools.

http://en.wikipedia.org/wiki/Mumbai

What is Dharavi?

It is a slum and administrative ward, over parts of Sion, Bandra, Kurla, and Kalina. In the 18th century Dharavi was an island. Has huge sanitation problems, including water supply.
http://en.wikipedia.org/wiki/Dharavi

What is Bollywood?
The film industry based in Mumbai. Can also called Hindi cinema. Song and dance is a big deal in Bollywood and the films are multi- million dollar productions.
http://en.wikipedia.org/wiki/Bollywood