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...human hair sold for wigs and stale bread used for cow feed. The money they earn from selling these materials is how they support their families. While my research focus was to understand how an informal economy like this one persists when confronted with formal government-backed services, I also learned how the exchange of cash between buyers and collectors of scrap...

...human tragedy - 46 people died - and an engineering mystery: why did a bridge built to last a century not make 40 years? Part 2: Stresses and strains...Video Transcript Narrator Clustering eyebars together, to make a suspension chain, was a demanding job. The pinning, or ‘threading’, was itself a difficult undertaking because of the tight tolerance between the pin and...

...human tragedy - 46 people died - and an engineering mystery: why did a bridge built to last a century not make 40 years? Part 3: The collapse...Video Transcript Narrator The Silver Bridge collapsed because of a minor flaw in just one of the eyebars that formed the suspension chain. The eyebar that failed, number 330, was positioned on the Ohio end of the bridge on its...