The Fox and the Duck in a Square Pond
112776
Can the boy escape the teacher for a regular $n$-gon?
96605
Animals at nighttime
61431
Wavy stream of liquid
70055
Birds sitting on electric wires: potential difference between the legs
120461
Polar Plots and square roots
103081
Square-tiling a torus
157477
Area of a quadrilateral proof
124374
A bijective function between a square and its side
22840
The sum of the first $n$ squares is a square: a system of two Pell-type-equations
23717
The furniture is/are
78885
Effect of the tail of the cat in the falling cat problem
85476
Seeking outline coordinates of bodies of water (lakes, rivers, ponds) for country?
10540
Prove $\vdash \neg(\square F\land p)$ in $KD$
141425
Jumping frog problem
114258
Stuff which squares to $-1$ in the quaternions, thinking geometrically.
154907
Possible bug with \implies and \Longrightarrow -- there's a dot in the middle of it
14211
Water and Ice with a Barrier