New posts in Recreational Mathematics

How many ways to read the palindromic word ROTATOR in this design?

Can you draw a curve that captures light?

Integral of $1/x^2$ without power rule

How few $(42^\circ,60^\circ,78^\circ)$ triangles can an equilateral triangle be divided into?

A $2021$ problem: $20\sim 21$ and $43\times 47$

Solving Dudeney's "A Question of Cubes": sum of consecutive cubes is a square

Is there (or can there be) a general algorithm to solve Rubik's cubes of any dimension?

Is there a clever solution to Arnold's "merchant problem"?

What's the minimum number of $2$s needed to write a positive integer?

Is every natural number the truncation of a prime?