Interestingly, one of the guys I was at university with was involved in the antarctic and other balloon flights that produced the data Krause is referencing in that clip.

I do geodesy and geophysics now, but my first degree was in astrophysics, and I still take an interest in it when I have time. IMO it's well worth looking at Lawrence (mis-spelled it above)Krause's full "Universe From Nothing" lecture if you have an interest in the subject:

Full Krause UFN Lecture

And also reading his book of the same title, which is one of the most "understandable by the lay person" books on cosmology I've ever come across.