In the last 7 years, humanity has discovered 43 potentially habitable planets.
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The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
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No one knows Albert Einstein's last words. Just before he passed, he spoke several words in German, but his nurse only knew English.
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The University of Oxford (teaching since 1096) predates the Aztec empire (1428 - 1521).
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Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
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