combinatorics - Draw a line through all doors - Puzzling Stack

I saw the following problem on 4chan and couldn't solve it: It's very likely to be some kind of troll (no solution). I'm hoping to see some rigorous proofs that disprove the existence of such a l

Combinatorial encoding of odors in the mosquito antennal lobe

Selective Formation of Monodisperse Right Trigonal-Bipyramidal and Cube-Shaped CdSe Nanocrystals: Stacking Faults and Facet-Ligand Pairing

combinatorics - Draw a line through all doors - Puzzling Stack Exchange

Contribution of Cotranslational Folding Defects to Membrane Protein Homeostasis

Combinatorial encoding of odors in the mosquito antennal lobe

combinatorics - Draw a line through all doors - Puzzling Stack Exchange

combinatorics - Draw a line through all doors - Puzzling Stack Exchange

combinatorics - Draw a line through all doors - Puzzling Stack Exchange

2158. Amount of New Area Painted Each Day - In-Depth Explanation

How does mathematical induction work? - Quora