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 Every once in a while, a little game is just the ticket. While St-Jean

is suffering from a water mains break, a little plumbing game from Mat is Fun:

                                                                

https://www.mathsisfun.com/games/plumber4.html

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Went through another tutorial on styling Matplotlib, and researched a few things.

This should allow mw to improve yesterday's cross product grapher, something I haven't

seen a good version of on the web. The central problem, though, is that the third vector

can get quite long, and may be negative...

                                                                         

                                                                                  

                                                                                      

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