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- What's the best invention ever? Why? Who invented it?
- What's the worst invention ever? Why? Who invented it?
- Who's the most famous inventor that you know? What are his inventions?
- What would you like to invent?
- Do you think time machine is a future invention?
- Do you think inventions always have some bad side effects?
- Do you think one day people can live on other planets? What inventions do they need to realize this dream?
- Do you know any inventor who was not successful when he was alive?