As investigators probe the cause of yesterday's tragic building collapse, which killed seven and injured dozens at last count, and workers continue to clear the site, the Times dives into the history of the two century-old tenement buildings that fell, including a floor-by-floor look at what was inside. Another attempt to understand a sad event is via science, that is, how explosions cause incidents like this. Also, why is Harlem the site of so many collapses? And did the lack of a de Blasio-appointed DOB commissioner have anything to do with it? [NYT/Nat Geo/NYDN; photo via Flickr/NYC Mayors Office]
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