Undertaken during a period of maximum sunspot activity, the International Geophysical Year (IGY) was an 18-month period of cooperation among the scientists of 67 nations for concentrated and coordinated geophysical study, primarily of the solar and terrestrial atmospheres. It produced scientific cooperation unimpeded by the Cold War and was the largest and most important international scientific effort to that date. What are some of the dozens of advances and discoveries achieved during the IGY?
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