It's genuinely good to hear that it's been appreciated (let alone so much). I owe the milkmaid example to my Calc 3 professor, many years ago, though I later re

It's genuinely good to hear that it's been appreciated (let alone so much). I owe the milkmaid example to my Calc 3 professor, many years ago, though I later realized that I'd probably altered it a little from his version.