AG, when we down-sized after my retirement, I donated a dozen big crates of electronics books, magazines and equipment to our local tech college. As far as I know, they're still there, gathering cob-webs, waiting for their first student in too-many hundreds who'll show a flicker of curiosity beyond 'ooh, shiny !'
In this thread's context, it would be the student who looks at the "2xAA + R + LED" circuit and says, 'But my cousin Darren does it with just a coin cell and LED; how so ?'
It may be a 'flash in the pan', it may lead to domes on Mars.