Thank you kindly. Exactly the sort of stuff I was looking for. Will consult that site in future.
My fave is "if you inscribe a sphere inside a cube and then divide the cube into a 38 x 38 x 38 lattice, the sphere will intersect the lattice at 6752 points."
Of course, most of my marathon diary readers will know this already, but I shall use it anyway.
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