In the last 7 years, humanity has discovered 43 potentially habitable planets.
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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
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If Earth's history was condensed into twenty-four hours, life would've appeared at around 4am, land plants at 10:24pm, dinosaur extinction at 11:41pm, and human history would’ve began at 11:58:43pm.
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