"electro-magnetic photons"
All the photons I've ever met were electro-magnetic. Is there any other kind?
Scientists have shown that explosions from the early universe might help in solving black holes' middle sibling problem. A statistical analysis of thousands of gamma-ray bursts, the luminous energetic explosions that follow the violent collapse or merging of stars, show a time delay to some of the signals, a tell-tale sign of …
What about those of us with a custom propane insert in the fire-box to make cold-starts easier?
Note that scrap wood is only good for redish spectrum and lower. Seasoned oak will get you into green and minor blues. You'll need to spring for coal if you want deep blues and violets.