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"Experimenters...can procure a speck of radioactive material...must enclose...self-addressed envelope"! This a footnote in the chapter that explains how to build your own cloud chamber with dry ice and a plungers. My uncle gave me this incredible book long ago that explains how to build an x-ray machine, generate more than 100'000 volts, create a computer with relays, build earthquake detector, etc. Yes, all of this can be found on the internet but only this book of articles from Scientific American from 1952 to 1960 will bring you back into those innocent times. - amazon