  I present a series of diagrams which illustrate why the cosmic microwave
background (CMB) data favor certain values for the cosmological parameters.
Various methods to extract these parameters from CMB and non-CMB observations
are forming an ever-tightening network of interlocking constraints. I review
the increasingly precise constraints in the Omega_m - Omega_Lambda plane and
show why more cosmologists now prefer Lambda-CDM cosmologies to any other
leading model.
