I took a short walk to the Post Office just now, and received three "Good morning!"s in the street.
I therefore propose a new SI unit, representing cheerfulness and respectability per unit time, or GR/s. Typical values would be:
- 0.60 to 0.10 for a British Politeness Society convention,
- 0.03 for my walk just now,
- 2.0 x 10-5 for a difficult country
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