Cicadas spend up to 17 years underground before emerging as adults for just a few weeks.
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The steam engine powered early industrial machinery.
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The Earth's inner core is primarily iron and nickel.
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Vaccines train the immune system to recognize pathogens.
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The longest winning streak in professional sports can span years.
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The Earth's rotation is gradually slowing over time.
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The brain named itself.
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Smiling can influence mood through feedback to the brain.
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The first successful human heart transplant was performed in 1967.
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