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• 85 What function can be differentiated twice, but not 3 times?
• 61 Closed Form for $~\int_0^1\frac{\text{arctanh }x}{\tan\left(\frac\pi2~x\right)}~dx$
• 61 When were 'time zones' (or at least time difference) discovered?
• 60 Interesting and unexpected applications of $\pi$
• 57 Does $\lfloor \sqrt{p} \rfloor$ generate all natural numbers?
• 47 Why is a rectangle a parallelogram, but a parallelogram is not a rectangle?
• 45 How can I write the numbers 5 and 7 as some sequence of operations on three 9s?
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