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99percentinvisible.org
b9PMQ
TIL that "Social Urbanism" approach to urban planning helped take Medellin from Pablo Escobar's most dangerous city in the world to a "model city" tourist destination. Medellin tackled crime and violence "not through more policing but through urban planning, infrastructure, and social programs."
Z8dEp
TIL that an artist, fed up by a poorly-signed exit near LA, secretly painted and installed an improvement which went unnoticed by the DOT for months
oBMpK
TIL that in 1978 an architectural student discovered that a skyscraper in NY could topple if strong winds hit the building. The engineer that is credited for designing the building then made secret nightly repairs in collaboration with the NYPD, without alerting the general public to the danger