Use real data for examples

[willgearty]

I think it would be more useful (and more aesthetically pleasing) if the data used for all of the examples (both in the readme and in the man pages) was real data (or "real" data) as opposed to just random points ("a swarm of angry bees" as one user mentioned to me on twitter).

[willgearty]

It might even be better (especially for the readme page) to use multiple different real datasets to demonstrate the use cases (e.g. paleontology, geochemistry, etc).