Enhanced oxygen evolution activity in NiFe layered double hydroxides via Ce doping and oxygen vacancy engineering

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Number (3): Everything in this light blue space must add up to 3. The answer is 1-2, placed vertically.

Nasa is adding an extra mission to its Artemis programme before it attempts to land astronauts on the Moon for the first time in half a century.

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"It's a state-of-the-art venue, you've got the infrastructure there to host that many people.

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