  The Cosmic Background Radiation gives us one of the few probes into the
density perturbations in the early universe that should later lead to the
formation of structure we now observe. Recent advances in degree scale
anisotropy measurements have allowed us to begin critically testing
cosmological models. Combined with the larger scale measurements from COBE we
are now able to directly compare data and theory. These measurements promise
future progress in understanding structure formation. Because of the extreme
sensitivities needed (1-10 ppm) and the difficulties of foreground sources,
these measurements require not only technological advances in detector and
measurement techniques, but multi spectral measurements and careful attention
to low level systematic errors. This field is advancing rapidly and is in a
true discovery mode. Our own group has been involved in a series of eleven
experiments over the last six years using the ACME (Advanced Cosmic Microwave
Explorer) payload which has made measurements at angular scales from 0.3 to 3
degrees and over a wavelength range from 1 to 10 mm. The recent data from these
and other measurements will be reviewed as well as some of the challenges and
potential involved in these and future measurements.
