A single teaspoon of soil contains more microorganisms than there are humans on Earth.
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The Earth's inner core is solid despite extreme heat.
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The human body produces red blood cells in bone marrow.
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The stegosaurus had a brain about the size of a walnut.
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Certain fish can inflate their bodies to appear larger.
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Smiling can influence mood through feedback to the brain.
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Mammoths and early humans lived at the same time.
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The Earth's axis is tilted about 23.5 degrees.
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The human skin is the body's largest organ.
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