Brian Schröäer wrote:
> 
> sorry if this has no ruby in it, but what does the 101 mean in the
> subject. Is it the firefighter's number or what does it mean?

American Universities typically number their courses
starting at 101 for the first year, 201 for the second
and so on.

So, for example, introductory physics would typically
be named something like Physics 101.

Regards,
--
Bil
http://fun3d.larc.nasa.gov