A blue whale's heartbeat can be detected from over 2 miles away.
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The Olympic Games are held every four years.
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Vaccines train the immune system to recognize pathogens.
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Curiosity can enhance learning and memory retention.
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The human body is about 60% water.
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The human body produces red blood cells in bone marrow.
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The Earth's axis is tilted about 23.5 degrees.
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The McGurk effect shows how visual cues can alter what we hear.
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The Earth's rotation speed varies slightly over time.
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