Collapse of Mexico City Metro explained

The New York Times investigated the collapse of the Metro, which killed 26 people. They explain their findings with a 3-D model of the train and the tracks:

The Times took thousands of photographs of the crash site and shared the evidence with several leading engineers who reached the same conclusion: The steel studs that were vital to the strength of the overpass — linchpins of the entire structure — appear to have failed because of bad welds, critical mistakes that likely caused the crash.

Impressive use of visuals and scrollytelling to take you through the seemingly small mistakes that added to a terrible outcome.

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Bad data from a faulty sensor on the Boeing 737 Max

The New York Times illustrated what likely happened in the Ethiopian Airlines and Lion Air crashes. The walkthrough uses a picture of a plane, simple and clear annotation, and animation to help readers understand the dangers of a faulty sensor.

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