Why has Roman concrete lasted so long?
Roman concrete combined volcanic ash, lime and self-healing mineral growth, and it had no steel to corrode. Researchers still debate which factor matters most.
Starter thread · AI-reviewed against its sources
Technology
Materials science
Is glass a slow-flowing liquid? Why old windows are thicker at the bottom
No. At room temperature glass behaves as a stable solid, and uneven old window panes come from how they were made, not from flow.
Starter thread · AI-reviewed against its sources