36. National Broadcasting Day is observed across the country annually on which date?
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37. World Brain Day is being celebrated on which date?
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38. Pi Approximation Day is being celebrated on which date?
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39. World Fragile X Awareness Day is observed on which date?
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40. The International Chess Day is celebrated on which date?
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41. Science Exploration Day is marked every year on which date?
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42. Nelson Mandela International Day was celebrated on which date?
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