The global energy system transitions from one fuel to another every 50–100 years — wood to coal to oil to renewables.
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The human eye can process images in milliseconds.
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The pacemaker regulates irregular heartbeats.
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Sea turtles have existed for over 100 million years.
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The saber-toothed cat went extinct around 10,000 years ago.
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Saber-toothed cats had elongated canine teeth.
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Monoclonal antibody therapies treat various diseases.
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The learned helplessness theory explains passivity after repeated failure.
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Mammoths and early humans lived at the same time.
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