The Chicken or the Egg
Settle humanity's most famous paradox once and for all using paleontology, genetics, and evolutionary biology. Learn why science has a definitive answer to which came first, and how the riddle reveals the way evolution actually works.
Like Duolingo, but for The Chicken or the Egg. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
A short one: 8 levels across 2 sections, about 16 minutes end to end, roughly 3 days at five minutes a day. It moves through Settle the Argument and Rethinking the Paradox. It starts from scratch.
Free forever · No credit card · iPhone & Android
Key ideas in The Chicken or the Egg
- Shelled eggs first appeared well over 300 million years ago
- The earliest birds and modern chickens did not evolve until hundreds of millions of years later
- The fossil record shows egg-laying animals thrived long before avian creatures arrived
- Before shelled eggs, vertebrates had to return to water or damp areas to keep their eggs from drying out, much like modern frogs do
- The self-contained, waterproof shell and internal membrane created a personal pond that let animals reproduce entirely on dry land
- This breakthrough paved the way for reptiles, dinosaurs, and eventually birds to conquer the land
- Fish laid soft eggs in water hundreds of millions of years before chickens existed
- Reptiles and dinosaurs laid hard-shelled eggs well before birds branched off
- Under the broad, literal phrasing 'an egg versus a chicken,' the egg wins without contest
- The literal question 'chicken vs. egg' is trivial because non-avian eggs existed hundreds of millions of years earlier
- The debate only becomes a real biological dilemma when narrowed specifically to 'the chicken or the chicken egg'
- The real puzzle hinges on whether a 'chicken egg' is defined by the bird that laid it or the chick that hatches from it
- A bird's core DNA is set the moment the egg is fertilized and does not change into a new species during adulthood
- Species change across generations through reproduction, not by an individual adult transforming
- Two almost-chicken parents passed genetic mutations through their reproductive cells
- The very first chicken began as a fertilized single cell developing inside an egg
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives The Chicken or the Egg the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
Compared to when shelled eggs first appeared, when did birds and chickens show up?
Get it right to open this lesson and 7 more in the app.
How to learn The Chicken or the Egg, step by step
Go in order. 8 short levels across 2 sections, about 16 minutes in all, five minutes a day.
- 1
Settle the Argument
- The Deep-Time Victory of the Egg
- The Genetic Moment of the First Chicken
- 2
Rethinking the Paradox
- The Illusion of the First Chicken
2 sections · 3 units · 8 levels. Built to play, not to enroll.
Questions about The Chicken or the Egg
How do I learn The Chicken or the Egg?
Go in order: start with Settle the Argument, then Rethinking the Paradox. On Tomo that's 8 short levels, about 16 minutes in all, played five minutes a day. Start free and play the first level in under a minute.
Is there a Duolingo-style app for The Chicken or the Egg?
Yes. Tomo works like Duolingo: short daily lessons, streaks and quick quizzes. The Chicken or the Egg is one of its free courses, and you can type any other topic to get a course of your own.
Is The Chicken or the Egg free?
Yes. The Chicken or the Egg is playable on Tomo's free plan, which doesn't expire. No credit card, no waitlist. Download the app and start your first lesson.
How long does it take to learn The Chicken or the Egg?
8 levels across 2 sections, about 16 minutes of play in total. It's built for five minutes a day, so you finish it a little at a time instead of all at once.
Do I need any background to start The Chicken or the Egg?
No. It's pitched at a beginner level, so it starts where you are and builds up. If you can tap a phone, you can start.
Tomo is in ChatGPT
Tomo is also a ChatGPT plugin: the same playable courses, built and played inside your chat.
Add Tomo to ChatGPT- What to ask
- “Make me a Tomo course on black holes.” “Turn this chat into a Tomo course.”
- What you get
- Quick questions with instant feedback, hearts and stars, ready to play in about a minute.
- Where it goes
- No sign-up to start. Connect your Tomo account and your streak carries on in the app.
You pick the voice
The Chicken or the Egg is taught in the Bestie style: your friend who just gets it. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
More Science on Tomo
The Physics of Your Senses
Discover how your brain translates the raw forces of the universe—like light waves and gravity—into the world you actually experience.
Quantum Realities: Time and Parallel Worlds
Move beyond science fiction to explore the rigorous physics of the multiverse, retrocausality, and the mathematical possibility of time travel. Master the mechanics of how reality branches and how time behaves at the quantum scale.
Why Clocks Fall Back
Unpack the hidden mechanics behind the biannual clock shift. Discover why we revert to standard time, how the shift disrupts our biology, and the surprising economic and political forces keeping the tradition alive.
The Beginning of the Universe
Trace the cosmos back to its very first moments using the clues hidden in today's night sky. Discover how expanding space, ancient starlight, and cosmic static reveal the origin of time, matter, and everything we see.
Time in Motion: Relativity and the Twin Paradox
Move beyond the basics of physics to understand why time isn't a constant, how speed alters aging, and why the famous Twin Paradox isn't actually a contradiction.
Forensic Science: Reading Physical Clues
Discover how real investigators extract facts from physical evidence. Learn the science of trace analysis, fingerprinting, DNA matching, and forensic timelines beyond the myths of television drama.
Start The Chicken or the Egg today.
Download Tomo, search The Chicken or the Egg, and play your first lesson in under a minute.