who discovered that the earth was round
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who discovered that the earth was round
who discovered the earth was round
who discovered that the earth is round
when was the earth discovered to be round
who discovered earth is round
when was it discovered that earth is round
who discovered that the earth was round, who discovered the earth was round, who discovered that the earth is round, when was the earth discovered to be round, who discovered earth is round, when was it discovered that earth is round