how to draw graphs with few crossings
... that when Pál Turán was forced to work in a brick factory during World War II, the bumpy crossings of the cart tracks inspired him to ask how to draw graphs with few crossings?
... that when <a href="./Pál_Turán" id="mwBFQ" rel="mw:WikiLink" title="Pál Turán">Pál Turán</a> was forced to work in a brick factory during World War II, the bumpy crossings of the cart tracks inspired him to ask <b id="mwBFU"><a href="./Turán's_brick_factory_problem" id="mwBFY" rel="mw:WikiLink" title="Turán's brick factory problem">how to draw graphs with few crossings</a></b>?