mdtohtml/1_situation/content/altmaterials_bone.md

### tools to make notebooks: do you need a folding bone?
This tool helps us to fold the sheets to avoid breaking paper, especially if thick, and to be more precise. For this, you can use the back side of any metal knife. Or anything that is flat, hard and with a smooth surface that you can easily hold in your hands. Try with other objects too, you will be surprised!