Did Rainbows End come true?
Largely, yes. Rainbows End (2006) has a P(n) of 78% on Nearfi's P(n) Board, our estimate of the chance its future arrives within 20 years. Of its 4 tracked predictions, 0 have arrived and 3 are arriving. Its central premise, 'Medicine can restore a person with advanced Alzheimer's disease to a functioning, independent life', is expected within 50 years. The next prediction is estimated to arrive around 2030.
Rainbows End is strongest on the interface: display eyewear, gesture input and silent messaging are arriving, though the full overlaid world is not. Mass destructive book-scanning and machine persuasion have real precedents, in weaker forms than the novel's. Its cure for Alzheimer's is the furthest off.
Read the review · 7.6/10 →
How this P(n) was calculated
P(n) is the chance that this work's future arrives within 20 years, by 2046. For each prediction we turn our estimate into a probability: arrived is 100%, diverged is 0%, and otherwise the low end of our 80% range counts as a 10% chance, the median year 50% and the high end 90%. Each prediction is weighted 1–5 by how pivotal it is to the story, and P(n) is the weighted average. P50 does the same by 2076. P(n), explained.
| Claim | Prediction · why this weight | Weight | Status · estimate | By 2046 | By 2076 |
|---|---|---|---|---|---|
| RE-1 | Most people use wearable displays (eyewear or contact lenses) with gesture or silent input as their everyday interface to the network. Major: the augmented world shapes every scene and sets the book's central question, whether you are wearing. |
4 | ARRIVING 2032 (2029–2042) | 94% | 100% |
| RE-2 | A university library's printed collection is destroyed in bulk by automated scanning and kept only as digital files. Major: the planned shredding of the Geisel Library's books drives the plot and climax. |
4 | ARRIVING 2030 (2027–2040) | 96% | 100% |
| RE-3 | Medicine can restore a person with advanced Alzheimer's disease to a functioning, independent life. Core premise: Robert Gu's recovery from Alzheimer's is why he is in the story at all. |
5 | NEAR 2050 (2038–2075) | 37% | 90% |
| RE-4 | Machine-generated persuasion, tuned to the individual and delivered through their own devices, reliably shifts what people believe. Major: the mind-control technology is the engine of the book's conspiracy plot. |
4 | ARRIVING 2030 (2027–2040) | 96% | 100% |
| P(n) = P20 = Σ(weight × chance by 2046) ÷ Σ weight = 13.3 ÷ 17 = 78% | |||||
| P50 = 16.5 ÷ 17 = 97% | |||||
Already here today (arrived 1, arriving ½, weighted): 35%.
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RE-1
Most people use wearable displays (eyewear or contact lenses) with gesture or silent input as their everyday interface to the network.
Weight 4/5 · Major: the augmented world shapes every scene and sets the book's central question, whether you are wearing.
Display glasses with a wrist band that reads finger movements went on sale in the US in September 2025 for $799, but only through store demo appointments, and Meta then paused its planned launches in the UK, France, Italy and Canada. This is a single small display in one lens, not the lenses and full overlay of the novel. Vinge himself said in 2012 that the open question was consumer acceptance, not the technology. We set the median a few years out because the hardware exists but mass adoption does not. 123
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RE-2
A university library's printed collection is destroyed in bulk by automated scanning and kept only as digital files.
Weight 4/5 · Major: the planned shredding of the Geisel Library's books drives the plot and climax.
Destructive scanning of purchased print books has been judged fair use in a US district court, and reporting based on unsealed filings describes a company doing it at scale. That is a corporation scanning books it bought, not a public library choosing to shred its holdings, and no such library programme is known. A different court went against the Internet Archive's lending of scanned books. We therefore count the technique as arrived and the library version as still to come. 456
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RE-3
Medicine can restore a person with advanced Alzheimer's disease to a functioning, independent life.
Weight 5/5 · Core premise: Robert Gu's recovery from Alzheimer's is why he is in the story at all.
Two antibody drugs are approved and slow decline in early disease: lecanemab by about 27 per cent over 18 months on the CDR-SB scale. Neither reverses the disease or restores function. The UK's NICE judged the benefits modest and the cost too high. Restoration from advanced disease would need a different class of treatment, and the range is wide because no such mechanism has been shown. 78
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RE-4
Machine-generated persuasion, tuned to the individual and delivered through their own devices, reliably shifts what people believe.
Weight 4/5 · Major: the mind-control technology is the engine of the book's conspiracy plot.
Controlled experiments in late 2025 found that short chatbot conversations moved voters' opinions by several points, more than traditional political adverts, and that the most persuasive models were the least accurate. The effects were small, mostly changed views of candidates rather than voting plans, and were measured in volunteers. The novel's device is a compulsion; the real thing is a nudge, which is why this is ARRIVING and not ARRIVED. 910
- FOR Meta launches Ray-Ban Display glasses for $799, but you can't buy them online. 9to5Google, 2025-09-17. Glasses with a full-colour display and a gesture Neural Band, on sale from 30 September 2025 at $799, sold in physical stores.
- AGAINST Meta has delayed the international rollout of its display glasses. Engadget, 2026-01-06. Launches in the UK, France, Italy and Canada postponed, citing demand and limited inventory; buyers in the US must book a demo.
- CONTEXT Author Vernor Vinge Predicted Google Glasses. NPR (Talk of the Nation), 2012-04-18. Vinge calls the 2012 Glass demo primitive next to the novel and names consumer acceptance as the key uncertainty.
- FOR LLMs can hoover up data from books, judge rules. The Register, 2025-06-24. Judge Alsup found that scanning purchased print books and destroying the paper copies involved no duplication, so was fair use.
- FOR Project Panama: How Anthropic bought and destroyed millions of books to train AI. Le360, 2026-08-06. Secondary report, citing unsealed court filings, of books bought, stripped of bindings and scanned destructively. Date as shown on the page, read as day-month.
- AGAINST Hachette v. Internet Archive Update: Second Circuit Court of Appeals Rules Against Internet Archive. Authors Alliance, 2024-09-05. Lending scanned copies of lawfully owned print books was held not to be fair use, a limit on what libraries can do with scans.
- FOR FDA Converts Novel Alzheimer's Disease Treatment to Traditional Approval. US Food and Drug Administration, 2023-07-06. Lecanemab reduced decline on the CDR-SB over 18 months in its Phase 3 trial: a slowing, not a reversal.
- AGAINST NICE publishes final guidance recommending against routine NHS use of donanemab and lecanemab. Alzheimer Europe, 2025-06-19. Benefits judged modest (27-33% slowing for lecanemab, 23-29% for donanemab), with heavy monitoring and cost.
- FOR AI chatbots can sway voters better than political advertisements. MIT Technology Review, 2025-12-04. Nature and Science studies: 3.9-point shift among US voters, about 10 in Canada and Poland, and a UK trial of 19 models with nearly 77,000 participants.
- AGAINST Chatbots spewing facts, and falsehoods, can sway voters. Science News, 2025-12-04. Bots rarely changed voting plans, the experiments were controlled, and users who knew AI makes mistakes were less swayed.
Ledger updated 4 Nov 2026. All works on the P(n) Board · Method