Update

rock.md

@@ -5,11 +5,11 @@ Rocks and stones are natural formations of minerals that can be used to create t
 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).
+- For [fun](fun.md) and entertainment, you can play various games with rocks: rock skipping, petanque, long throw, 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.
+- For writing, some can be used as a chalk, some may be used to carve text into, which makes the texts last very long (that's why we have records of very old history, see also [RCBD](rock_carved_binary_data.md)). 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.