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What did Leonardo Da Vinci mean when he said ‘There are three classes of people: those who see, those who see when they are shown and those who cannot see’?

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What did Leonardo Da Vinci mean when he said ‘There are three classes of people: those who see, those who see when they are shown and those who cannot see’?	341
Why does Route 66 go from Chicago to Los Angelos and not across the whole United States?	1