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| How many children they had? | |
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| They had four children: Karl, the twins Emma and Grete, and Erwin. | |
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| Who was the theologian professor of Berlin University that become a close friend of Planck? | |
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| He was Adolf von Harnack. | |
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| Who was the second wife of Max Planck? | |
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| His second wife was Marga von Hoesslin. | |
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