So my Wikipedia wandering went from Nap to Non-aggression Pact, thence to Category:Treaties, then Moon Treaty, then L5 Group, Lagrangian Point, Lissajous Curve, Spirograph ... and thence to this site containing fractals, figures based on Fibonacci sequences, 3n+1 games, cellular automata, shape-packing through simulated annealing, and algorithmic solving of Sudoku puzzles. A great site, well-put-together, and worth your while.
The lovely song's text and chords are here.Chervonu rutu ne shukaj vechoramy; ty u mene yedyna, til'ky ty povir. Bo tvoya vroda to ye chystaya voda, to ye bystraya voda z synix hir.P.S.: The autograph sheet music.