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Units of length from largest to smallest
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Everyday materials by hardness
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Kingdoms of living beings by number of species
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Objects in the universe by size
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Strongest muscles in the human body
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Legendary scientists by birth
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Living beings by genetic similarity to humans
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Waves of the electromagnetic spectrum by energy
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Materials by hardness
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Liquids by boiling point
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Parts of the nervous system by number of neurons
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Animals by sharpness of their vision
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Colors of light by wavelength
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Groups of living beings by appearance on Earth
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Great theories of physics by date
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Largest volcanoes in the solar system
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Animals by number of hearts
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Chemical elements by age of their discovery
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Cooking processes by temperature
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Human body systems by number of organs
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Temperatures in the universe from coldest to hottest
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Largest organs in the human body
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States of water by temperature
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Blood types by frequency in the world
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Longest bones in the human body
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Fast things in the universe by speed
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Solar system bodies by temperature
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Most abundant elements in the universe
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Materials by density (which ones float)
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Great scientific discoveries by date
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Densest metals
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Medical advances by date
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Fastest-growing plants
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Gases in the Earth's atmosphere
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Human senses
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Fundamental forces by strength
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Layers of the Earth by depth
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Layers of the atmosphere by height
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Living beings by number of neurons
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Natural phenomena by energy released
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