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"Whether it's possible to have integrated scenarios that maintain a high-grade fusion plasma with these specific flows of excess fuel and ash from the plasma needs to be determined," Schwartz said.

By the mid '80s he was believed to be the most prolific high-grade hashish smuggler in the business, importing thousands of tonnes of cannabis into the UK and US.

Canada, rich with high-grade deposits, could become a nuclear “superpower”.

There is only “weak evidence” that high-grade face masks better protected health workers than surgical ones in the pandemic, the Covid inquiry has been told.

In recent years, however, the depletion and rising price of high-grade phosphorus ores have become a problem, putting pressure on industries that rely on these supplies.