1: Five
2: Seven
3: Four
4: 10 times
5: Nightly
6: Mesozoic
7: What branch of mathematics was at the center of a feud between Gottfried Leibniz and Isaac Newton?
8: Layers of hot air
9: A proton

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1: Five
2: Seven
3: Four
4: 10 times
5: Nightly
6: Mesozoic
7: What branch of mathematics was at the center of a feud between Gottfried Leibniz and Isaac Newton?
8: Layers of hot air
9: A proton