On twitter I saw this image from the NW Tsunami Alerts, 
and thought we’d use it in Physics to talk about vectors, velocity, speed and displacement. One small problem that my clever students figured out was that the distance didn’t seem right N-S, I had given them a Robinson Projection which while a good compromise in how do flatten a sphere. What the students rightly picked up on was that the one thing distorted is North/South distances.
