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The problem of \1/f" noise has been with us for about a century. Because it is so often framed in\udFourier spectral language, the most famous solutions have tended to be the stationary long range dependent\ud(LRD) models such as Mandelbrot's fractional Gaussian noise. In view of the increasing importance to\udphysics of non-ergodic fractional renewal models, and their links to the CTRW, I present preliminary\udresults of my research into the history of Mandelbrot's very little known work in that area from 1963-67.\udI speculate about how the lack of awareness of this work in the physics and statistics communities may\udhave affected the development of complexity science, and I discuss the differences between the Hurst effect,\ud\1/f" noise and LRD, concepts which are often treated as equivalent

On the continuing relevance of Mandelbrot’s non-ergodic fractional renewal models of 1963 to 1967