One of the fastest ways to tell a science from a sales pitch is to ask for the literature. Cryonics has one. The claims made throughout this Codex, that memory lives in structure, that vitrification preserves that structure, that the damage may be repairable, are not assertions we invented; they rest on published, peer-reviewed work, much of it freely readable. This is a curated reading list, grouped by the question each paper helps answer. Where a study is technical, the one-line summary tells you what it found; the link takes you to the source so you can judge for yourself.
Does memory and identity survive preservation?
This is the load-bearing question, addressed conceptually in memory, identity and the brain. The empirical anchors:
- Persistence of Long-Term Memory in Vitrified and Revived C. elegans (Vita-More and Barranco, 2015). Nematode worms retained a learned, scent-based memory after being vitrified and revived, evidence that the freezing process did not erase the stored information.
- What are memories made of? A survey of neuroscientists on the structural basis of long-term memory (Zeleznikow-Johnston, Kendziorra, McKenzie, 2025). Of 312 neuroscientists surveyed, 70.5% agreed memories are stored in the pattern of neuronal connections, the premise cryonics depends on.
How well can the brain actually be preserved?
- Aldehyde-Stabilized Cryopreservation (McIntyre and Fahy, 2015). The technique that won the Brain Preservation Prize, preserving whole rabbit and pig brains with crisp, traceable synapses, demonstrating that fine neural structure can survive preservation.
- Ultrastructural and Histological Cryopreservation of Mammalian Brains by Vitrification (Fahy et al., 2026). Whole-brain ultrastructure preserved by vitrification alone, without prior aldehyde fixation.
- Cryopreservation of brain cell structure: a review (McKenzie et al., 2024). A review of 97 studies on how preservation methods affect brain structure, honest about where current techniques succeed and where they fall short.
- Structural brain preservation: a potential bridge to future medical technologies (McKenzie et al., 2024). Argues current preservation methods have a non-negligible chance of success and merit serious research.
Toward reversal: rewarming and recovery
- Functional recovery of the adult murine hippocampus after cryopreservation by vitrification (German et al., PNAS, 2026). Brain tissue showing recovered function after vitrification, a concrete step beyond mere structural preservation.
- Physical and biological aspects of renal vitrification (Fahy et al.). A rabbit kidney vitrified, rewarmed, transplanted, and shown to function, the landmark proof that a whole vitrified organ can be brought back to work.
- Sound waves for solving the problem of recrystallization in cryopreservation (Alcala, Risco et al., 2023). High-intensity focused ultrasound for rapid, uniform rewarming, one approach to the central rewarming problem.
Roadmaps and honest forecasts
- Biostasis: A Roadmap for Research in Preservation and Potential Revival of Humans (Kendziorra et al., 2024). The research agenda: better protocols, quality metrics, and the factors around cardiac arrest that decide case quality.
- Practitioner forecasts of technological progress in biostasis (McKenzie et al., 2025). Twenty-two experts forecast the field's challenges and the candidate revival strategies, useful precisely because it does not pretend to certainty.
- Winter is coming: the future of cryopreservation (Bojic et al., 2021). An interdisciplinary review of the field's real obstacles: scaling to large volumes, preventing ice, and reducing cryoprotectant toxicity.
The wider context
- Cryopreservation of Oocytes and Embryos (Dhali et al., 2018). A reminder that cryopreserving human cells is already routine medicine; the question is one of scale, not principle.
- Sleuthing subjectivity: a review of covert measures of consciousness (Kronemer et al., 2025). On the hard problem of detecting consciousness, relevant to how we will ever assess a revived mind.
- Survey of US internet users' sentiments towards cryopreservation (Gillett et al., 2021). On the gap between public awareness and participation.
Essays and longer reads
Not papers, but worth your time. The Scientists' Open Letter on Cryonics, signed by dozens of researchers, states that cryonics is a legitimate, science-based endeavor. Aschwin de Wolf's A Skeptic's Guide to Cryonics argues the case on skeptical, not faith-based, grounds. Robert Freitas's Cryostasis Revival lays out, in detail, how nanomedicine might one day repair and revive a patient. And for the most readable introduction of all, Tim Urban's essays remain the friendliest door into the whole subject.
You do not have to take cryonics on trust. The science is published, the debates are in the open, and the honest papers are as clear about the unsolved problems as about the progress. Read them, and decide for yourself.