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• 32 Moon's pull causes tides on far side of Earth: why?
• 28 Why 干菜类 was mistakenly translated to Fuck Vegetables?
• 21 Should a spacecraft be launched towards the East?
• 17 Solutions of the functional equation $f(2x) = \frac{f(x)+x}{2}$
• 16 Is the proof of $\lim_{\theta\to 0} \frac{\sin \theta}{\theta}=1$ in some high school textbooks circular?
• 14 How do I find the sum of $\frac{\cos(n)}{n!}$?
• 13 Uniqueness of determinant
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