That's fun! The guys in the first slide (Amp my FOB) are from my lab. It's rather shocking how much you can glean from looking at the currents going into a building. They can identify different types of lights being turned on in the lab from the main fuse box by looking at transients involved.
The tourniquet seems cool. I can imagine that being immediately useful.
I wouldn't mind more information, but I'm partial to SOFTT-W touriquets. I can deploy them with one hand fairly easily. I do think folks are overly fond of tourniquets, but I understand the reason. If you have a decent knowledge of where the major veins are, pressure works a lot better than a complete tourniquet. Ideally, you'd only tourniquet basically a bleeding stump. OTOH, precision when folks are shooting at ya is hard, and it's easier to train folks to just tourniquet at the arm pit or upper leg.
The doc that trained me told me only to tourniquet if I didn't mind losing the limb. Getting shot at? Tourniquet it right now and move on. Because being shot in the head or having your head sawed off by wogs is worse than maybe unnecessarily losing an arm. Nasty compound fraction while hiking or camping? I'd really try my hand at localized pressure, and only tourniquet if unsuccessful.
Hopefully someday there is a smart combination tourniquet slash pressure bandage that combines the positives of both while being quick, easy, cheap.
And yep. I'm told that it's surprisingly easy to use traffic analysis on electrical feeds. Not usually enough for you to be able to tell what channel a person is watching, but easily enough to tell the difference between a PC or laptop, or CFL vs LED lighting.