Who really owns Antarctica?

Who owns Antarctica (wiki)?

Business Insider: During the first half of the 20th century, seven countries — including Britain, Norway, and New Zealand — laid claim to certain regions of Antarctica. However, their claims are only recognized by the respective countries themselves. A larger version of the infographic is here, and a brief video explanation is below.

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From CGP Grey, a video explanation:

h/t Geeks Are Sexy