Discovering how concepts such as energy, mass, space, force and charge can be replaced by frequency, density and motion . On the website is a more detailed essay, a note on gravitational and inertial mass including interpretations of Newton's bucket of water experiment and some of the qualities of gyroscopes; a booklist and a transcription of Xmas lectures at the Royal Institution 1974 (which were banned for a time) by Eric Laithwaite .
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