10 thoughts on “A historical infographic for Microsoft”

  1. Manhole covers are round because it prevents them from falling into the hole and possibly hurting the people working below. That’s one prime example of well-thought engineering that doesn’t cost much.

  2. Manhole covers are round because it prevents them from falling into the hole and possibly hurting the people working below. That’s one prime example of well-thought engineering that doesn’t cost much.

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