It has formally announced that it will begin the first phase of construction of an enormous particle accelerator around 2020, which will be twice the size and seven times more powerful than CERN's Large Hadron Collider (LHC).

Europe's LHC is the largest single machine in the world, a huge circular tunnel 17 miles (27 km) in circumference. But China's planned Circular Electron Positron Collider (CEPC) could (almost) literally run rings around it – it will be between 30 and 62 miles in circumference, large enough to circle Manhattan.

Wang Yifang, director of the Institute of High Energy Physics, Chinese Academy of Sciences, has suggested Qinhuangdao, a northern port city near the start of the Great Wall, as an ideal location for the underground facility.