1) Old Fortran code was intimidating. New Fortran isn't. 2) C can be faster than Fortran (not by a lot mind you). But when it comes to math-y type things,

1) Old Fortran code was intimidating. New Fortran isn't. 2) C can be faster than Fortran (not by a lot mind you). But when it comes to math-y type things, Fortran code can be made very, very fast, and can be parallelized with little to no effort.