This one time, I was chatting to a work mate about how, in emergency situations, you can charge your flat cellphone batteries just enough for one more phonecall with sunlight. Recently, a couple of climbers got into trouble on a NZ mountain and used that trick to call for a rescue. My work mate asked me if I would have thought of that. I told her that I probably would have just used body heat to warm the batteries, perhaps by sitting on it. She said it needs sunlight to work. And I said, “Well, the sun does shine out of my arse!”
Anyway, back to me…