Learning involves changes in neural connections.
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The primacy effect describes better recall of early information in a sequence.
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Saber-toothed cats had elongated canine teeth.
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The invention of the hypodermic syringe enabled effective drug delivery.
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The Olympic Games are held every four years.
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The Earth's outer core is liquid metal.
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A lion's roar can be heard from several miles away.
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Smiling can influence mood through feedback to the brain.
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