Humorist Will Rogers once said, "It's not what we don't know that hurts; it's what we know that ain't so." As engineers, how much of what we know "ain't so"? We rely on information and calculation methods we assume have a firm foundation in reality only to sometimes find they do not. That is what happened in 2005, when, asked by an attorney to investigate the failure of a HVAC system to provide the owner's expected comfort conditions, I reviewed ...

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