Revert "CENSORE"

This reverts commit 51c4db334f.

rock.md

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+# Rock
+
+Rocks and stones are natural formations of minerals that can be used to create the most primitive [technology](technology.md). Stone age was the first stage of our civilization; it was characterized by use of stone tools. Rock [nerds](nerd.md) are called geologists.
+
+Rocks are pretty [suckless](suckless.md) and [LRS](lrs.md) because they are simple, they are everywhere, free and can be used in a number of ways such as:
+
+- As a building material.
+- For [fun](fun.md) and entertainment, you can play various games with rocks: rock skipping, petanque, even [chess](chess.md).
+- As [weapons](weapon.md), even though we discourage this use.
+- For making tools such as [knives](knife.md) or [hammers](hammer.md).
+- To hold heat: you can e.g. heat stones in fire and let them heat you while you sleep or use them to cook something.
+- For writing, some can be used as a chalk, some may be used to carve text into. A dust from some rocks can be used to make dye to paint or write with.
+- As weights.
+- For help with counting (e.g. [abacus](abacus.md)) -- this makes rocks a kind of [computer](computer.md)!
+- To make [art](art.md), decorations, small statues etc.
+- For breaking things, grinding, sharpening etc.
+- With advanced technology we can get metals out of rocks, extract geological knowledge from them etc.
+- Some rocks can be used to start [fire](fire.md).
+- Some are pretty rare and can be used as a [currency](currency.md), even though we hate money and discourage this as well.