  I explain the origin and evolution of anisotropies in the Cosmic Microwave
Background (CMB) and argue that upcoming experiments will measure cosmological
and fundamental parameters very accurately. Most of the paper focuses on
present data, which strongly suggest that the universe is flat. Several
arguments are given to prove that present data sets are not contaminated by
systematics. New techniques to compare different experiments visually are
introduced. These are illustrated for two years of the MSAM and Python
experiments.
