Electric tram was invented by?
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Who invented the contact lens?
Which country on 23 October 2017 signed the Paris agreement on climate change, leaving the United States and Syria as the only two countries holding outto sign this global climate pact?
Who invented the hot air balloon?
Who discovered Sodium?
Who discovered Penicillin?
Who discovered Proton?
Who discovered Fullerene (an allotrope of carbon)?
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