The Opportunity Mars rover was designed to last 90 days — it operated for 15 years.
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The barreleye fish has a transparent head and upward-facing eyes.
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The Earth's axis is tilted about 23.5 degrees.
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Mammoths and early humans lived at the same time.
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The human eye adapts to darkness by increasing light sensitivity.
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Your stomach replaces itself every few days.
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