Time travel is, if scientists are to be believed, impossible. That has never stopped science fiction writers, who have made it one of their most frequently used and popular concepts. But if time travel is impossible, can it at least be made plausible?

With his novel Timescape (1980), Gregory Benford sought to do just that. This believable SF epic draws on Benford's own professional experience as a scientist, and is rooted in the prevailing theories in theoretical physics of that time. This a time travel novel with a difference, and one which matches mind-bending science with vivid portraits of scientists at work.

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Science fiction is famously difficult to define. In 1952, the writer and editor Damon Knight famously wrote that "science fiction is what we point to when we say it." But what if what we point to is just the surface, just an aesthetic, and what really matters is what is underneath?

This episode is a brief exploration of what I see as the important gap between two linked, but different things: the living, breathing genre of SF, and the host of images that it has spawned and carried with it through the years - its aesthetic.

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This is an exploration of four short novels by a neglected female writer of SF who sought to subvert the genre from within.

One happy development in recent years is the growing awareness of the contribution of women writers to the development of classic science fiction. Today, writers like Leigh Brackett, C. L. Moore, and Andre Norton are fairly well known in genre circles. Readers and explorers of past decades continue to rediscover women writers, and to- hopefully - bring their work to greater prominence. Today's focus is on one such writer - Margaret St. Clair.

The Ace Doubles line was a long-running and now highly collectible fixture of western, crime, and SF publishing from 1952 to 1978. Published in the unusual dos-a-dos format, they bound together two novels, generally by two different authors. Of the eight novels that St. Clair published, half saw print in this special format - one of them joined with an early book by Philip K. Dick.

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