2026-11-10 · By Todd Michael Gori
Keeping Two Explanations Apart: A Side-by-Side Check Before You Blend Them
When two explanations of the same idea sound similar, it is easy to let them drift into one blurry account. A simple side-by-side method helps you keep each one intact and test where they actually differ.
Why Explanations Blur Together
When you read two accounts of the same topic in a row, your memory tends to merge them. The phrasing from the second one overwrites the first, and within a day you may remember a hybrid that neither author wrote. This is a normal memory effect, not a sign of carelessness. The fix is to make the two explanations separate objects you can compare on purpose, rather than leaving them as a fading impression.
The retrieval research summarized by the Learning Scientists is useful here. They describe retrieval practice as trying to recall material from memory before checking the source, and then checking notes to correct gaps and misunderstandings. Applied to two explanations, this means you first reconstruct each one from memory, label it, and only then compare. The comparison happens after recall, so the blending risk is caught while it is still visible.
A Worked Example
Suppose you are studying how a password hash is checked at login, and you have two explanations: one describes the system as storing a salted hash and recomputing it on each attempt; the other describes a lookup table keyed by the username. These are hypothetical summaries for this example, not quotations from any source. A careless reader might come away believing the system stores a salted hash in a lookup table, which is a reasonable-sounding blend but a mix of two designs.
A cleaner method is to write Explanation A on one line with its key claims, Explanation B below it with its own claims, and then a third column listing only the points where they disagree. In the example, the disagreement is about what gets stored and where the comparison happens. Once the disagreement is written as a single question, you can check which explanation fits your source material rather than averaging them.
A Small Reader Exercise
Pick a topic where you have two short explanations, perhaps from two different chapters, articles, or your own notes from different weeks. Set a timer for five minutes. Without looking, write down the core claim of the first explanation in two sentences. Then do the same for the second. Only after both are written, open the originals and mark any sentence where your recall was a blend. Count those blends. A high number tells you the two accounts are too similar for you to hold apart yet, and that you should space the review across a few sessions rather than cramming both at once, following the spacing idea the Learning Scientists describe: revisiting material across multiple sessions instead of concentrating it in one.
A Checklist You Can Reuse
Before you merge two explanations into one note, work through these items in plain order. Write each explanation's core claim from memory before opening either source. Keep each explanation under its own label, with its origin noted. List the specific points of disagreement as questions. Check your recall against the originals and mark any blended sentences. Decide whether the two accounts describe the same thing at different levels, or actually conflict. Only merge them after you have answered the disagreement question, and if you cannot answer it, keep them separate and schedule a return visit.
Limitations: this method helps with explanations you can read side by side. It does not verify whether either explanation is correct, and for technical material you still need to check against a primary reference or a working test in your own owned environment.