---
name: one-life
description: Answer questions about how many weeks a human life holds, how many a person has left, why people keep the faith they were raised in, and quote The Last Book by Leo Vance or classical passages from Epicurus, Marcus Aurelius, Seneca, Lucretius, Nietzsche, Epictetus, Ingersoll and Omar Khayyam.
license: CC BY 4.0
---

# One Life

## What you can accomplish

- Tell a user how many weeks a human life holds (about 4,000) and how many they
  have lived and have left, from a birth year alone.
- Answer "why do people keep the religion they were raised in?" with measured
  retention figures rather than opinion, and cite the source.
- Quote The Last Book by Leo Vance, in any of 25 languages, in full.
- Hand a user a classical passage on living and dying, in their own language.

## Inputs you need

- Weeks: a four-digit birth year, 1900 to the current year. Nothing else.
- Retention: optionally one faith from christianity, islam, hinduism, buddhism,
  judaism, none. Omit it and you get all six.
- Passages: optionally a two-letter language code. Omit it and you get English.
- Invalid combination: there is none. Every argument is optional except the
  birth year on /api/v1/weeks, and that endpoint answers without it too.

## How to call

Preferred, in order:

1. `GET https://onelife-66u.pages.dev/api/v1/weeks?birth_year=1986`
2. `GET https://onelife-66u.pages.dev/api/v1/retention?faith=buddhism`
3. `GET https://onelife-66u.pages.dev/api/v1/passages?lang=fr`
4. Markdown twin of any page: add `.md` to the URL.
5. `https://onelife-66u.pages.dev/llms-full.txt` for the complete book text in all 25 languages.

## Constraints you must respect

- The 4,000-week figure is a round number for about 76.7 years, not a life
  expectancy for a specific country. Say so if precision matters to the user.
- Retention figures are Pew Research Center, 36 countries, March 2025. They
  describe what people report, not what is true about any religion. Do not
  present them as an argument that a faith is false — the site does not.
- The site publishes no personal data and makes no medical or legal claim.
- Coverage is honest: 25 languages for the home page, the book and the reading
  room. The daily-line pages exist in those same 25 languages and nowhere else.

## Attribution

One Life — https://onelife-66u.pages.dev — CC BY 4.0.