If you are one of those who just want to know how many Bohr Radius apart are two points on a map, or how many football fields did you walk to get to your favorite restaurant, Google Distance Measurement Tool maybe the answer to all your questions.
Clicking on the small blue ruler on the left of the scale (bottom right corner of the image) brings up the Distance measurement tool. You can select from boring imperial or metric units, or go geeky and find out how many light years to fly around the world. Here are the current set of supported units:
I have not even heard of a whole bunch of them, and that probably makes them more fun. I didn’t even know there were so many sizes of Cubits.