  Protostellar core formation is probably much more dynamic, and magnetic
fields are probably much less important, than has been previously assumed in
the standard model of low-mass star formation. This revised picture has
important consequences: it is easier to understand the observed rapidity of
star formation in molecular clouds; cores are more likely to have structures
favoring high infall rates at early times, helping to explain the differences
between Class 0 and Class I protostars; and core structure and asymmetry will
strongly favor post-collapse fragmentation into binary and multiple stellar
systems.

Astrophysics