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Commerzbank proposed a solution to Greece's financial woes, saying finance minister Yanis Varoufakis had proposed a one-off licence fee of 1 euro on EU users of Pythagoras' theorem. The catch? The incredibly long period since 1st April 570BC, ostensibly the date when the theorem first came up, to today, a period of more than 2,500 years. Including a compounded interest rate of 4% per annum, the resulting amount is a whopping 107,443,980,002,362,000,000,000,000,000,000,000,000,000,000 euros!