Well I am glad that The Swerve edged out The Giver. The result of all the discussion of the part that On the Nature of Things by Lucretius plays in The Swerve has convinced me that it would be worthwhile to tackle Lucretius first. The happens to be the translation into English by John Selby Watson available in audio format for free download here at LibriVox:

On the Nature of Things LibriVox recording