Please write the evolution of humans by natural selection in the form of a recipe.
GPT-3.5
GPT-6 Astra
A Recipe for Humans: Evolution by Natural Selection
Prep time: Several million years for the human lineage; billions for the evolutionary pantry
Yield: One highly social primate species—with plenty of variation
Important: No chef, blueprint, or predetermined outcome required.
Ingredients
- An ancestral primate population
- Heritable variation, continually replenished by mutation and genetic recombination
- Changing environments
- Limited resources
- Differences in survival and reproductive success
- Many, many generations
- A generous dash of chance
Method
Begin with ancestral apes.
Use populations that lived in Africa millions of years ago. Humans did not evolve from today’s chimpanzees; humans and chimpanzees share an earlier ancestor.Fold in variation.
Each generation inherits a slightly different mixture of traits. Mutations introduce new genetic variants—not because they are needed, but without regard to whether they will prove useful.Let circumstances do the sorting.
In particular environments, some inherited differences help individuals leave more surviving offspring. Over generations, those variants can become more common. This is natural selection.Allow upright walking to develop gradually.
In early human relatives, anatomical changes made habitual two-legged movement possible. Its advantages likely varied across habitats and activities. Do not add a fully modern human skeleton all at once.Stir in changing diets, dexterous hands, and cooperation.
Across branching human lineages, food gathering, tool use, social learning, and shared care interacted with biological evolution. Tools and behavior changed the conditions under which selection operated.Simmer brain evolution slowly.
In several lineages, larger and differently organized brains evolved alongside changes in bodies, development, and behavior. Brains are energetically expensive: increase only where the reproductive benefits outweigh the costs.Keep the mixture branching.
Human evolution was a bush, not a ladder. Many related species coexisted; most eventually went extinct. Some, including Neanderthals and Denisovans, interbred with ancestors of living humans.Continue until Homo sapiens emerges.
By roughly 300,000 years ago, populations in Africa exhibited features associated with our species. There was no single generation in which a nonhuman parent suddenly produced a fully modern human.Do not declare the recipe finished.
Humans continue to evolve. Culture, migration, disease, diet, and other conditions keep changing the evolutionary kitchen.
Cook’s Notes
- Natural selection is not the only process at work: genetic drift and gene flow also change populations.
- Evolution does not aim at perfection: it produces workable compromises from inherited materials.
- Results are not guaranteed: rerun the recipe, and you should not expect humans again.
What changed
The funny thing about GPT-3.5’s recipe is that it quietly smuggles in a cook. It says to “preheat the planet,” then “stir occasionally to ensure that the process of natural selection is occurring evenly,” which is exactly the guiding hand evolution doesn’t have. It’s charming, and “1 dash of time (millions of years)” is a good joke, but it says almost nothing about humans beyond “including humans” at the end.
Astra turns that tension into the point. It opens with “No chef, blueprint, or predetermined outcome required” and closes with “rerun the recipe, and you should not expect humans again.” In between, the recipe steps carry real content: a shared ancestor with chimps, a “bush, not a ladder,” Neanderthal interbreeding, and the dry warning “Do not add a fully modern human skeleton all at once.” It is much longer and has one garbled line about mutations (“not because they are needed, but without regard…”). Still, the extra length mostly earns its place, because the reader actually learns how evolution works.