Taken from the September 2020 issue of Physics World, where it appeared under the headline "Lattice layabout in the park". Members of the Institute of Physics can enjoy the full issue via the Physics World app.
In this article (originally published in Lateral Thoughts, Physics World’s regular column of humorous and offbeat essays, puzzles, crosswords, quizzes and comics, which appears on the back page of the print edition), Hamish Johnston wonders how best to pack people into a park, while respecting COVID-19 social-distancing regulations
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