CNN  —  Ever since the Great Exhibition opened its doors in London 174 years ago, the World’s Fair has offered nations a chance to show off the greatest inventions of the age. But Expos of recent decades have been as much about diplomacy and public relations as innovation. It is little surprise, therefore, that the mastermind behind Expo 2025 — which commences this weekend in Osaka, Japan, just three years after the end of Dubai’s Covid-delayed Expo 2020 — doesn’t express his vision in terms of

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