Memory

The Time Stream – Can disaster to an entire civilization be averted if diligent researchers roam the time stream looking for it? What if that disaster can only be prevented by denying a couple the right to marry? What if their love is the catalyst for the destruction of the world? How can free will be balanced against world destruction?

Early science fiction stories and collaborations by Fletcher Pratt.

Moon of the Unforgotten – Two Captain Future novelettes by Edmond Hamilton (1904-1977)