Let's say you travel 10km directly south, turn and travel 10km east, then travel 10km directly north

The fact that I came even close is a bad joke.  I know nothing about math or directions.  I am really not your man for this one. 

Tom, your meds. Take them. 

lol

I remember answering a question about the possibility of aliens and suggesting that they might only register to us as a disturbance in our vision fields---a ripple, so to speak.  (And I actually borrowed the idea from CS Lewis from a book in his space trilogy."

But a response to my answer was as classic as yours---an individual posted:  "Let's smoke."

Thank you for not revealing the answer. Maybe more will answer. By the way, did you get the extra credit? This post was edited by Element 99 at June 29, 2017 1:13 PM MDT

No, we had never studied anything like this in his class---and I totally panicked because I was always expected to get the highest grade in most tests, regardless of subject.

Fortunately, I eventually realized that I could shrug off that expectation.

I guess you would have to do it in the winter. Global warming sux. But I did say travel, not walk. This post was edited by Element 99 at June 29, 2017 3:52 PM MDT

exactly :) It is about the earth being round. You walk 10 miles south (any direction is south when you stand on the north pole), then you walk east along the latitude circle 10 miles south of the pole, and finally walking 10 miles north takes you back to where you started.

North pole.