When the maintenance men finally saw the light.

Problem solving in strange circumstances

In the 1980’s, there was a great deal of concern about the erosion of the Lincoln Memorial.

The maintenance staff were asked what they thought was the cause.

They responded that the damage was due to a strong cleaning spray used to keep the masonry free of bird poo.

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Learn about life the universe and everything from a bunch of people at a fun edtech company. www.42courses.com