2017-07-17 3 min read


All links today :)

Planning & Strategy.

Making & Manufacturing.

Maintenance, Repair & Operations.

  • Roman concrete, which contained a combination of seawater and volcanic ash, produces tobermorite and phillipsite as it ages - minerals that help fill any cracks that develop over time.
  • On the hostility that NYC MTA workers (who are certainly not at fault for the underfunded system's woes) endure on a daily basis.

Distribution & Logistics.

Inspection & Testing.

  • A good post on geometric search engines, which (similar to a Google Image Search) allow the user to query a database of geometries directly rather than via metadata. One use case I've heard of for these is for helping CAD systems automatically fix issues caused by changes far back in a feature tree; if the system knew how the old shape looked & acted, maybe it can make a good guess about how your new shape should look & act as well.
  • Related, Octopart adds robust categories & filtering!
  • A real takedown of Blue Apron's economics. An interesting idea: "Because Blue Apron cannot retain customers for extended periods of time [that] means that customer acquisition cost is effectively part of cost of goods sold."
  • A geographically accurate NYC subway rail map.


How to keep train conductors alert: Have them point at a checkered sign at every subway station.

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