[Cobbydaler]

Dr Greg Brittles' eyes gleam with excitement when he explains the project he is working on.

"It's every engineer's dream really, to have a project that's technically challenging, which requires you to develop new technology and solutions to hard problems, but that are also simultaneously important for the world to have."

Since finishing his research at Oxford University five years ago, he has been working for Tokamak Energy, a UK start-up that has plans to build a fusion reactor.

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