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Go to the profile of Mary Holden
Mary Holden
Editor and writer.
Jun 4, 2016
Ask Ethan: How do we know the Earth isn’t flat?
Ethan Siegel
539

…because “circumference” is a word that tucks you in at night?

  • Go to the profile of Mary Holden

    Mary Holden

    Editor and writer.

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    Go to the profile of Mary Holden
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