Tragedies involving building collapses prompt structural engineers to figure out what happened, and how to prevent it from recurring.
Bacteria can produce their own 'buildings' so scientists are genetically engineering them to build ours.
Reinforced concrete is everywhere. But unlike plain concrete, which can last for centuries, reinforced concrete can deteriorate in decades as the reinforcing bars succumb to rust.
Crews patch them, just to see these recurrent potholes come back again. New research focuses on microwaves zapping patches to make a more permanent pothole fix.