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Greenland ice sheet hides huge 'impact crater' https://t.co/o52yzrMkWW -
How 'miniature suns' could provide cheap, clean energy https://t.co/CRGenyqUZ3
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Definition of kilogram set to change https://t.co/0NwsVV2HbV
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RT @ProfBrianCox: In the current fractious climate, the most relevant retweet I’ve had the pleasure to make during my time on Twitter. https://t.co/Jq7ECQ2VH0
