Dragonflies were among Earth's first winged insects — their wingspan once reached 70 cm in the Carboniferous period.
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In 2001, a Norwegian man survived a fall through ice by floating in near-freezing water.
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The human brain continues to develop into early adulthood.
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A horned lizard can squirt blood from its eyes as a defense.
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The vaccination syringe improved medical delivery methods.
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