My dear friend Prof. Zhang Weiwei debating with Jeffrey Sachs at Fudan University yesterday. As a warm-up, Prof. threw me in the line of fire, so I attempted, impromptu, a crossover between the Brazilian and American elections. Then Jeffrey delivered a masterclass in Eurasia sustainability, spanning 3000 years. At lunch, with other Fudan professors, we all ripped into hardcore geopolitics, big time. Shanghai totally rocks.