Started reading this to better understand 4k tech and what 4k really means, but it also goes into some really neat details about how the movie industry's use of cameras has evolved.
Learned a neat lesson with my phone: a full 24 hours out in the country and my phone has dropped to only 70% by keeping the 4g and wifi radios off. Almost like a non-smart phone. Still able to txt and make calls if I need to, and have two or three times fired up the 4g (to post this ;) for a moment or two.