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Can you elaborate? I didn't get what are you pointing at.

Some fans decided to try and get accurate densities for as many materials as possible so that their in-game simulations reflect their actual properties.

http://www.bay12forums.com/smf/index.php?topic=80022.0

The other reply linked to the forum thread, but just to elaborate, fans of the game obtained a box of Saguaro wood, then proceeded to measure the solid density and reported their findings.

That said, what actually prompted the raws to get updated was this: http://imgur.com/EPtgt

And the jokes on that page will only make sense if you play DF.

One more bit of background that may help you make sense of this. In DF, material properties, among other things, are defined in the "raws" (text files that contain assorted figures, like solid density).

You can see an example of what they look like here, on the DF wiki - http://dwarffortresswiki.org/index.php/v0.34:Saguaro/raw

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Density was determined experimentally. Contact Uristocrat for a sample if you want to verify this yourself. A 6g (+/- 0.1g) piece of dry Saguaro wood had a volume of approximately 14 cm^3 (+/- 1 cm^3) [SOLID_DENSITY:430]

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