Every time we build something we run the risk that it'll collapse. When structures collapse, people suffer. Keeping structures up and designing ones that won't collapse is a constant challenge for architects and engineers because if gravity had its way, everything would just fall down, and, eventually, everything will.
Add earthquakes, floods and high winds and the result can be a wave of destruction and death. Engineers struggle to figure out exactly how collapses happen, so they can design structures that offer safety instead of danger.
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