Do You Know?

1. How is nail polish related to automobile paint?
2. What is the "gum" in chewing gum?
3. How does sellotape work or any other sticky tape work?
4. Optical fibre is made from transparent glass or plastic. How can it be
used to transmit light? Why does the light remain within the fibre?
5. Whales, elephants and humans are largish mammals. Which are the smallest mammals?