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15 Hardest Math Problems In The World (Unsolved)
But what about the hardest math problems that are still left unsolved? There are several of these problems in the world that ...
Business Insider India3mon
The 12 hardest-working cities in the world
1. Hong Kong, China — 50.1 hours: Far in the lead, the hardest, or at least, longest-working people in any major city in the world call Hong Kong home. Home of the Asia headquarters of many of ...