Good feast for the brain cells. Makes total sense to think about Fine structure constant (the gap's length of a hydrogen spectral line) as a common factor for communication between us and the extra terrestrial intelligent visitors (because hydrogen is the most abundant element in the universe). Loved the explanation on Type 1,2,3 power houses and how to make the travel possible "they" have to be at least Type 2 and humans are yet to achieve Type 1 status. The way he connected the audio clip to prime numbers to FSC to 1400 Mhz etc. is mind boggling. Good watch. Oh btw the blurb that google shows for this movie description is wrong. There is no solitary middle aged woman in this movie.