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"Everyone is working towards what will be a fantastic Tokyo games. In the unlikely event that it is required, London, as it has done throughout history, will do its best to step up to the plate."

"Experts have given positive feedback and they regard the book as something the world needs now to deal with the pandemic," Li said.

"Even though there are amazing innovations nearly every day in the way 3D printers are used in key industries, including automotive, aerospace and medical, we believe that we're still just scratching the surface of the potential for 3D printing as an enabler of digital transformation," said Tim Greene, research director at consultancy IDC.

"Defund the police", a rallying cry from protesters angry at George Floyd's death in Minneapolis police custody two weeks ago, seemed to have hit a wall at the White House and on Capitol Hill on Monday, as Democratic lawmakers proposed sweeping legislation to combat police violence and racial injustice.

"Done well, there could be positive environmental outcomes for the island communities on the reefs (and could) safeguard the island communities well into the 22nd century," he said.