Things I know nothing of

Yes there are a lot. Many thousands and millions, in fact, if I were to be shown a pie chart of All Things, the tranche that I would know about would be so infinitesimally small that I would probably feel hopelessly depressed.
However, I am supremely good at wondering about Things; how they come about, how anyone could of even have thought up of the mechanics of say a Bulldozer, let alone set in place the manufacture of one; how people invented televisions, hair dryers, food processors, the fridge, maths, hydraulics, cars, molecular gastronomy - and in some cases - why? How does electricity really reach all the little plastic squares in my house? I have a vague idea, as vague as where I think my liver might be ( really must look at a book on anatomy).
Yesterday, I went down to the supermarket and was amazed to see, apart from the fact the car park was full of rubble (and Bulldozers) that there was a sort of metal stand from which thirty-foot high flames were leaping. I was actually more amazed to see that no one else appeared to be amazed, car boots were being filled, trolleys wheeled and all usual supermarket client behaviour.

I parked and went over to gawp and realised that the whole petrol station was in fact being moved. How do you move a patrol station? Incredible. The danger element (hence the metal flame-thrower as a petrol safety valve?) alone, the logistics, and again, why? What was wrong with it as it was? The powers at Leclerc, having been faced with the fact that Super U had gone through a minor re-looking, have obviously decided to retaliate with a massive overhaul and expansion program, thus a need to move the petrol pump area.
I climbed onto a boulder and studied the scene of the semi-unearthed petrol holding tanks. It reminded me somewhat of the scene in Quatermass and the Pit when they discover an alien spaceship while digging a new tubeline. I'd often wondered, while filling the car, about how big the tanks must be, and there they were, revealed, my questioning answered.

I was obviously getting too close to these fascinating operations as someone in a yellow hard-hat was approaching so I took a couple of hasty pictures and entered the shop to buy A4 paper (imagine the machinery required to cut, bleach, re-cut, pack and deliver it) and cat food - not something I wonder about too much if I can help it.