In the past, people readily used materials with unknown properties. Sure, they used some durability tests for different materials, but these usually ended with approximate results. Unfortunately, a lot of times this ended in disaster. Furthermore, some materials, although durable and easy to mold, tend to become toxic over the course of the years. In the past, however, this was something that science had no way of determining due to a lack of adequate tools for the job. Finally, there are also hidden properties of materials, such as different behavior under certain climate conditions or external pressure.