It’s been such a long time since my last post. Since then, I’ve graduated from Carleton College, moved to Brooklyn, and starting developing software for a firm over in Manhattan. Now that I’ve found my new groove, and now that I have some down time due to the holidays, I figure it’s time to write a new post!

One awesome perk about my job is that on Fridays, the developers get sent these brain teasers to solve. Today I’d like to share one particularly interesting problem.

**The Problem:** How many points are there on Earth such that you can walk one mile south, one mile east, and one mile north only to end up at the same starting point? Describe these points. Assume that the Earth is a perfect sphere.