Dogs can smell fear through chemical signals in human sweat.
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The Human Genome Project mapped the entire human genetic sequence.
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The first successful human heart transplant was performed in 1967.
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A grizzly bear can run surprisingly fast over short distances.
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Some sharks can sense a drop of blood from far away.
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The stegosaurus had a brain about the size of a walnut.
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The human body contains trillions of cells.
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Water covers more than 70% of Earth's surface.
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DNA carries genetic information in living organisms.
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