Keep it simple!
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Metrology is a complex subject, however applying a lean mindset to the whole subject gives us this:

| Condition | Forecast |
| Stone is wet | Rain |
| Stone is dry | Not raining |
| Shadow on ground | Sunny |
| White on top | Snowing |
| Can’t see stone | Foggy |
| Swinging stone | Windy |
| Stone jumping up and down | Earthquake |
| Stone gone | Tornado |
It’s rather like the urban legend:
images, lean, toolsDuring the space race back in the 1960’s, NASA was faced with a major problem. The astronaut needed a pen that would write in the vacuum of space. NASA went to work. At a cost of $1.5 million they developed the “Astronaut Pen”. Some of you may remember. It enjoyed minor success on the commercial market.
The Russians were faced with the same dilemma.
They used a pencil.
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