Who invented the bifocal glasses?
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Blood Circulation was discovered by?
Which of the following branches of mathematics was invented by Newton?
Who discovered Circulatory System?
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?
Which of the following was the first antibiotic discovered by Alexander Fleming in 1928?
Stainless steel was invented by
Who discovered Proton?
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