How to make your own ultrasound gel (which is also sterile and edible and environmentally friendly) **UPDATED--NEW RECIPE**
I have been doing lots of bedside ultrasound lately and realized how useful it would be in areas far off the beaten track like Haiti, for instance. With a bedside ultrasound (mine fits in my pocket) I could diagnose heart disease, kidney and gallbladder problems, various cancers as well as lung and intestinal diseases. Then I realized that I would have to take a whole bunch of ultrasound gel with me which would mean that I would have to check luggage, which is a real pain when traveling light to a place where luggage disappears. I heard that you can use water, or spit, in a pinch, or even lotion, though oil based coupling media apparently break down the surface of the transducer. Or, of course, you can just use ultrasound gel. Ultrasound requires an aqueous interface between the transducer and the skin or else all you see is black. Ultrasound gel is a clear goo, looks like hair gel or aloe vera, and is made by several companies out of various combinations of propylene glycol, glyce...
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The problem is that I have always been a curious, open, information omnivore... a generalist to the max. As I grow older and more comfortable in this sedentary setup (with a screen to the world) I'm spending far too much of my time here. That is, I have about 2 or 3 lifetime's worth of projects away from this chair that I'd like to pursue, but I'm not Doing (as i once Did). I am, however, both eternally hopeful, and divinely discontented... which should be enough, if/when I wake, to boil more water for tea... and go outside to pee and take a look around... and listen. ^..^
However, I think that you are on to something, with regard for those for whom books are becoming an 'oddity'-- people younger than a certain age-- whose iPhone "pocketful of miracles" is just a 'given'. You seem to be on a cusp, in that regard... aware of both 'worlds' (or "states of being"). I'm curious to see what conclusions you draw from your observations. ^..^