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1921: British scientist and pioneering pathologist Sir Bernard Spilsbury (1878 - 1947), at St Bartholomew's Hospital, London. (Photo by Topical Press Agency/Getty Images)

A look at ten very unique questions that some of the most brilliant men and women still quarrel over. When you take a minute to think about it, there are so many things we still don’t have definite or even well-substantiated answers for. From the possibility of advanced life extension, to the apocalyptic end of our universe as we know it, prepare to put your thinking caps on.