Light&Fire Coming soon to the App StoreSoon · App Store

You pick a subject. You leave with three sources that genuinely exist.

A video to lay the groundwork, a podcast for the journey, a book to go all the way down. Light&Fire writes nothing: it goes out and finds, and it verifies. What follows is the app's real index of suggested subjects — two of them are laid out here in full. You can also type your own: the catalogue is a starting point, not a limit.

64 subjects 7 domains 3 steps per journey FR and EN

History

Empires, revolutions, key figures

  1. 001The fall of the Roman Empire
  2. 002The French Revolution
  3. 003The Silk Road
  4. 004The Ottoman Empire
  5. 005The building of the Great Wall of China
  6. 006The fall of the Berlin Wall
  7. 007The Byzantine Empire
  8. 008The slave trade and its abolition
  9. 009The Industrial Revolution
Liberty Leading the People, painting by Eugène Delacroix: a woman raises the tricolour above the barricades.
Delacroix, 1830

Sciences

Physics, biology, mathematics

  1. 010Quantum physics
  2. 011Artificial intelligence
  3. 012The theory of evolution
  4. 013Einstein's general relativity
  5. 014The human genome
  6. 015Space exploration

    1. Step 1 — Getting Started · Video · 14 min

      Les trous noirs in French

      ScienceEtonnante — YouTube

      What a black hole is made of, where you find them, and why nothing comes back out. Enough to hold a serious conversation, in a quarter of an hour.

      Watch →

    2. Step 2 — Going Deeper · Podcast · 1 h 06

      Qu'y a-t-il au fond d'un trou noir ? in French

      300 milliards d'étoiles — Usbek & Rica

      Astrophysicist Alain Riazuelo takes the question past where the video stops: the singularity, the horizon, and the point at which physics runs out of things it can say.

      Listen →

    3. Step 3 — Mastering It · Book

      Les Trous noirs in French

      Jean-Pierre Luminet — De Vive Voix, 2001

      The French astrophysicist who produced the first simulated image of a black hole, in 1979 — forty years before the photograph of M87 alongside.

      Find the book →

    Three real sources, verified on 30 July 2026.

  8. 017Regenerative medicine
  9. 018CRISPR and gene editing
The first image of a black hole: a ring of glowing orange matter around a circular black shadow.
M87*, Event Horizon Telescope, 2019
The first image of a black hole: a ring of glowing matter against a black field.

An image that took a hundred years to obtain. Thirty seconds to find.

Event Horizon Telescope — M87*, 10 April 2019

Art & Culture

Painting, film, music

  1. 019The Impressionist movement
  2. 020Jazz
  3. 021Street art
  4. 022The Italian Renaissance
  5. 023Silent cinema
  6. 024Surrealism
  7. 025Analog photography
  8. 026Italian opera
  9. 027Manga and Japanese animation
Impression, Sunrise by Claude Monet: an orange sun over the port of Le Havre in blue haze.
Monet, 1872 — the painting that named the movement

Philosophy

Ideas, schools of thought

  2. 029Existentialism
  3. 030Confucius' philosophy
  4. 031Enlightenment philosophy
  5. 032Zen Buddhism
  6. 033Nietzsche's philosophy
  7. 034Taoism
  8. 035Machiavelli's political philosophy
  9. 036The ethics of artificial intelligence
Marble bust of the emperor Marcus Aurelius, curled beard, gaze lowered.
Marcus Aurelius — Heraklion museum
Detail of Liberty Leading the People: the armed crowd advances through the smoke of the barricades.

The learning does not happen here. It happens wherever you go next.

Eugène Delacroix — Liberty Leading the People, 1830

Economics

Markets, theories, major crises

  1. 037The 1929 crash
  2. 038Bitcoin
  3. 039Free trade
  4. 040Capitalism and its critics
  5. 041Globalization
  6. 042The circular economy
  7. 043Cryptocurrencies beyond Bitcoin
  8. 044Game theory
  9. 045Global inequality
Crowds massed outside the New York Stock Exchange during the crash of October 1929.
Wall Street, October 1929

Nature

Ecosystems, species, climate

  1. 046Coral reefs
  2. 047The Amazon rainforest
  3. 048Animal migration
  4. 049Volcanoes
  5. 050Marine biodiversity
  6. 051Climate change
  7. 052Bees and pollination
  8. 053Antarctica
  9. 054Endangered species
An outcrop of multicoloured coral and shoals of fish on the Great Barrier Reef.
Flynn Reef, Great Barrier Reef
An outcrop of multicoloured coral and shoals of fish on the Great Barrier Reef.

Seven domains. Not one is a module, not one has a syllabus.

Flynn Reef, Great Barrier Reef — photo Toby Hudson, CC BY-SA 3.0

Sports & Video Games

Competitions, records, gaming culture

  1. 055The history of the Olympic Games
  2. 056The Football World Cup
  3. 057The history of video games
  4. 058The rise of esports
  5. 059The most impressive sports records
  6. 060The history of tennis
  7. 061The Paralympic Games
  8. 062The indie video game industry
  9. 063Doping in sport
  10. 064Formula 1
An athletics event in the Panathenaic Stadium at the Athens Olympic Games, 1896.
Athens, 1896 — the first modern Games

Devil's Advocate

On a subject that divides, one podcast is not enough.

Economics, philosophy, society: when a subject is genuinely contested, the podcast step splits in two. Two episodes, two opposing arguments, and the call is yours. You do not leave with an opinion, you leave with what you need to form one.

What this mode will never do: fill the second slot with an off-topic episode just to look complete. If it finds no credible counter-argument, it says so. And if the subject is not divisive at all, it flatly refuses —

Devil's Advocate — on

Subject requested: Black holes

Versus

Devil's Advocate: this topic is factual rather than divisive — there is no serious opposing thesis to offer here.

The Daily Spark

The same subject for everyone, until midnight.

Every day, one spark: a subject drawn from the catalogue, the same for every user, changing at midnight. It is the product's standing appointment — not one more notification, a subject held in common.

The flame

One flame a day. A streak that forgives.

You keep your streak alive by finishing a journey — passed on a quiz or marked as done. One flame a day, no more. The streak survives a missed day and only goes out past two.

Flames buy flame colours in the shop. That is all they do. Nothing here punishes you for having a life.

What it costs

Free, and it refills every night.

The free journey count resets every day at midnight UTC. That is what gives the product its rhythm: come back tomorrow, there is room.

A Premium subscription at €4.99 a month is planned to lift that limit. It is not live yet — nothing is for sale today, and the app says so as plainly as this page does.

Sixty-four subjects to start with. And every other one.

Light&Fire is in beta and is not downloadable yet. This page will be the first to carry the link.

Coming soon to the App Store — iOS first

Want to be told when it lands? Write to support@light-and-fire.com. No form, no list — just an email we read.