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November 1, 2018
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How much you know about the Earth.

1
Current thinking is that the Earth was formed about 4.6 billion years ago; when is it estimated that oxygen first became a significant element in the Earth's atmosphere?
2
Which global charitable foundation, founded in 1936 and headquartered in London, works to improve health and support work in science, the humanities, the social sciences, education, public engagement
3
Which nation tested the most powerful nuclear weapon ever detonated?
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