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I got two milk crates of rock climbing magazines from an old roommate. I learned a lot from the Tech Tips sections, much like the catalog tips. Interesting to see the history and evolution of things as well. I suspect that while the catalogs are outdated, there would be interesting for a newbie...

Solar radiation, I'd bet. I suspect every living thing has some amount of radioactive material in it, if ever so slight. That stuff is floating around in the air. Nagasaki, Hiroshima, Chernobyl, and any other above ground nuclear testing or accidents.