We often keep large maps and posters rolled up – usually to save space. When you want to look at these or use them it can be difficult to keep them flat. Here is a method that might help. 1. HUMIDIFYING MATERIALS Humidifying is a process of carefully introducing moisture into paper and then drying it under controlled conditions. A simple but effective humidifier can be constructed out of two plastic garbage cans. The materials in the humidifier will absorb moisture without ever coming in…