The struggles of pioneers is similar to the first encounter of the
student with a subject. It therefore follows that a neophyte would
benefit from understanding the history of the development of a
field. The first detection of a fine structure line of astronomical
value and interest was [OIII] 88 micron line by the Cornell group
led by <a
href="https://www.dur.ac.uk/ias/fellows/0708fellows/martinharwit/">
Martin
Harwit</a>.  I took the occasion to talk to Martin on the eve of
preparing for this class. Martin was not only a pioneering astronomer
but also a scientist and citizen of great intellect (cf. <a
href="https://www.cambridge.org/core/books/cosmic-discovery/D4CD749F4E76CB30D46EC9DB54F56BC6">Cosmic
Discovery</a>). An earnest tyro would benefit from reading the
history of this important field of ISM in the words and presentation
of the leader: MartinHarwit.email.
Harwit's <a
href="../../../BigFiles/Heidelberg_Harwit_2015.ppt">recounting</a> of the
First Decade of FSL astronomy and the associated notes,
Heidelberg_Harwit_2015_Notes.pdf. The program of the 2015 Heidelberg
workshop is Heidelberg_2015_FSL_Workshop.pdf. Despite his amazing
accomplishments Martin was not well recognized -- not uncommon.
Some scientists are very good at leveraging their modest achievements
to great recognitions, some are naive or do not have supportive
colleagues (cf. Zwicky).