Bjørn Christian Weinbach (@bcwein343) profile picture

Bjørn Christian Weinbach

@bcwein343
 Sogndal, Norway
Joined December 2014
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Bjørn Christian Weinbach retweeted
Wonder of Science (@wonderofscience) profile picture
Wonder of Science
@wonderofscience10 Sep 2019
Carl Sagan explains how the ancient Greeks knew the Earth was round and calculated its circumference over 2,000 years ago.
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