Joshua Wong plonks himself down on a plastic stool across from me. He is there for barely 10 seconds before he leaps up to greet two former high school classmates in the lunchtime tea house melee. He says hi and bye then bounds back. Once again I am facing the young man in a black Chinese collared shirt and tan shorts who is proving to be such a headache for the authorities in Beijing.

So far, it’s been a fairly standard week for Wong. On a break from a globe-trotting, pro-democracy lobbying tour, he was grabbed off the streets of Hong Kong and bundled into a minivan. After being arrested, he appeared on the front pages of the world’s newspapers and was labelled a “traitor” by China’s foreign ministry...

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