these days we all have stress concentrations

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Further reading: 

Behaviour of Skin Fatigue Cracks at the Corners of Windows in a Comet I Fuselage - Ministry of Aviation
https://web.archive.org/web/20070614204718/http://naca.central.cranfield.ac.uk/reports/arc/rm/3248.pdf
The Cohen Committee Report: 
https://reports.aviation-safety.net/1954/19540408-2_COMT_G-ALYY.pdf

in the commercial: Local Forecast - Elevator Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 License http://creativecommons.org/licenses/by/3.0/