Lecture 02, 18.300, Thu Feb 03, 2022.
Summary
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 Recap point #000.
 Then cover, in this order: #004,  #001, #002, #003 [Traffic Flow].
                            #006a,                  [1D Gas Dynamics].
 Stress how important quasi-equillibrium is [point 1 in #002 and #006b].
        This is where the actual ``physics'' is built into the equations!
 Note: skip #005, which will be in a problem set.
 Note: on #006a told the class what happens if molecular effects [viscosity,
       thermal conductivity, etc] are added, to get the Navier Stokes eqns.
 We will talk more about these effects later.
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