Following on from my world-building piece about 'Sasha', I thought I'd do something similar for the 'Cassandra Kresnov Series'.

Obviously there's a fair few scientific improbabilities in Cassandra's world, starting with Earthlike planets of roughly similar gravity, atmosphere, etc. My technical excuse is that the primary scientific improbability (faster than light travel) gives humanity such a wide range that even if such worlds are a million to one, humanity now has access to tens of millio...