X is for X!: "The Seven Bridges of Königsberg" by Leonhard Euler

 9-193

M is for Math bonus

Summary: Odd numbers bad.

Bonus: Tom Cruise totally looks like Artosis here.

Commentary: 

Problem: Can you cross all the bridges exactly once in one route?

Answer: No

If I understand Euler correctly, the short version of the solution is: You can't have anything other than 0 or 2 sections with an odd number of bridges for it to work. 3/5 I've heard of this problem before, and it was nice to see it well explained.

I'm thankful for puzzles. They're fun.