As someone who first and foremost uses his understanding of Science and logic to base every action and thought, never relying on emotion, I would like to say I am a believer that nothing is impossible, especially in the world the Returners and I lived through.
I have seen every manner of creature and feat that were once the things of stories and myth with my very two eyes: magic exists, superpowers exist, and so should anything else that was impossible.
Time and time again, I have proven that word to be incorrect, be it facing down opponents ranking and outnumbering me and coming out on top.
Or crafting functioning items that shouldn't work, I have done and seen it all, disproving the meaning behind that very word. There should always be a reason for something happening, and just like the false, overly-used phrase "It came out of nowhere," something will always come from somewhere.