Zipf's Law

A favorite topic of interest: Zipf's Law.  by Vincent Granville.  Great topic for kids with an interest in numbers and patterns in data,

A Colleague Mentions the Hapax Legomenon

The dreaded Hapax Legomenon is mentioned and I have to look it up.  Nothing to do with children's building blogs or Greek Gods.  Its a kind of 'black swan' of literature;

Finally found it: It is the Hapax Legomenon
And its meaning is a little more subtle than just obscure.
And for math lovers it is also related to what is called Zipf's law.
Here is more: http://en.wikipedia.org/wiki/Hapax_legomenon