...and people designing the sampling and reconstruction algorithms for measuring the CMB:So, who really has to understand it all? A few thousand circuit designers and audio engineers, and programmers of SRC software (who as a rule don't get it). That leaves out a few billion of people ...
Hinshaw et al, First YearWilkinson Microwave Anisotropy Probe (WMAP1) Observations: Data Processing Methods and Systematic Errors Limits,
http://lambda.gsfc.nasa.gov/product/map/dr1/pub_papers/firstyear/syserr/wmap_syserr.pdf