The loop, explained with a loaf of bread.
Every open question in science works like a kitchen mystery: you know how things should go, something doesn't, and you test your way to the answer. Here's one you can solve in a few clicks.
The mystery
The recipe promised the loaf would rise 2.0×. It rose 1.3×.
So 0.7× of rise is missing. Something is wrong, and we don't know what.
Check that the yeast is alive
Stir a spoonful of yeast into warm sugar water and see if it foams within 10 minutes.
Why this one next: If the answer is "yes, that's the problem", it could explain up to 0.8× of the missing rise, and it's the best value for the effort (free · 10 minutes).
Free · 10 minutesThe loop
Every test goes all the way round. Run the first one and watch each step fill in.
- 1 · What we don't knowIs the yeast still alive?
- 2 · The testCheck that the yeast is alive
- 3 · The result
What the test shows.
- 4 · The picture updates
Suspects are ruled out or confirmed; the gap is re-measured.
- 5 · What to test next
Every remaining test is re-ranked.
What we don't know yet
Every possible cause, sorted by why it's uncertain. Each has a test that would settle it.
Never checked
Things that could matter but nobody has looked at.
- Test #1Is the yeast still alive?
The packet was opened 8 months ago, and nobody has checked it since.
Check that the yeast is alive · Free · 10 minutes - Test #5Does chlorine in tap water slow the yeast?
People argue about it, but nobody has checked with this water.
Bake two mini loaves: tap water vs bottled · An afternoon
Only a rough guess
Things we have a number for, but a shaky one, or from a single source.
- Test #2How hot does the oven really get?
The dial says 450°F, but home ovens often run 25–50° off. It's only a guess.
Check the oven with a thermometer · $10 · 1 day - Test #3Does this flour need more water?
A single blog post says so. No one else has tested it.
Try a slightly wetter dough · An afternoon
Sources disagree
Places where the advice points in different directions.
- Test #4Do you have to knead for 10 minutes?
One forum says knead for 10 minutes; another says no-knead bread rises just as well.
Knead one loaf, not the other · An afternoon
The picture: how bread rises
Everything bakers know, in one diagram. Side inputs are the suspects; the last one that changed is ringed.
suspect, untested ruled out a cause new idea
From bread to biology
OpenQuestion runs this same loop on open questions in human disease.
| In the kitchen | In science | On the fatty-liver question |
|---|---|---|
| The dense loaf | An open question | Why fat builds up in the liver in type 2 diabetes |
| Cookbooks, forums, other bakers' notes | Papers, trials, datasets | 29 papers and 7 dataset records |
| How bread rises | The causal model | Fat supply, fat made in the liver, fat export, body weight |
| “The loaf should rise 2×” | A prediction | “Pioglitazone should cut liver fat about 10%” |
| It rose 1.3× | A trial that disagrees | A trial measured 54% |
| Suspects | Knowledge gaps | Missing links, numbers poorly pinned down, studies that conflict |
| Yeast in sugar water, an oven thermometer | Lab experiments | Cell and worm experiments at qualified labs |
| “The kitchen is too cold” (new idea) | A proposed missing mechanism | Adiponectin makes the liver burn fat |
| A baker in Denver shares a result | Labs worldwide feeding one shared model | Every lab's result updates the same model |
| Bake again and check | Confirm a new prediction | Predict a trial before it reports |