What is the greatest invention ever?, What invention would you like to invent?, What is Mother Nature’s greatest invention?, What is the world’s most useless invention?, Do you think the person who invented the atomic bomb was happy with his discovery?, What modern inventions do you have at home? How often do you use them? , What modern inventions do you want to have at home?, What are the 3 greatest inventions of all time?, Does computer save time or do they make us waste more time? , What do you want to see invented in the future?, Which modern invention can't you live without?, Do modern inventions make our life easier? Give examples..

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