49.The Rich Work Longer than the Poor
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47.The High Cost of Cheap Fashion
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42.Why Would a Lemming Kill Itself
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40.Endangered Sea Turtles
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41.Rain Forests Are Not Green
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37.Greenery Promotes Better Health
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39.How Do Whales Prevent from Being Sunburnt
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38.Primary Care Is Needed
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35.Humor, a Double-edged Sword
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36.Continual Stress Affects Our Health
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