ERROR! In my riff on the perfect sphere, I used only data about how round the Earth is. Ronnie shares with us the true truth: (thought the Earth is amazingly smooth.
“If you were to blow up our spheres to the size of the Earth, you would see a small ripple in the smoothness of about 12 to 15 mm, and a variation of only 3 to 5 metres in the roundness,” Leistner told New Scientist.
