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Engineering Thermodynamics, free textbook by Olivier Cleynen My textbook, Engineering Thermodynamics, free download
Learn Fluid Mechanics with Olivier Cleynen My video course, Learn Fluid Mechanics (2026)

From the window of my previous appartment

April 2, 2013
by Olivier Cleynen

A story in three pictures, titled “The Vertical One is Just Slightly Harder Chalk”.

im_05744
One
Two
Two
im_05822
Three

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(more by Olivier: articles, thermodynamique [francais], thermodynamics [english], fluid mechanics)