Students across China have joined in a wave of dissent hitting the country, holding up blank sheets of paper in silent protest. From the streets of several Chinese cities to dozens of university campuses, protesters have shown an unprecedented level of rebellion not seen since leader Xi Jinping assumed power a decade ago. One journalist, working in China, said more than 50 universities nationwide have seen protests organised over the country's strict COVID policy. China protests – latest: 'Utterly extraordinary' scenes This level of dissent has not been seen since the army crushed the 1989 pro-democracy movement centred on Beijing's…