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Terms of Use · South Africa

Parts of this site are rewritten on a schedule and parts were written once. Knowing which is which is what tells you when something on a page is worth re-reading and when it is not.

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100+ instruments  ·  Founded 2008

This site is built from two kinds of writing with two different lifespans. Some blocks are measured readings that are replaced on a cycle and carry the moment they were taken; the rest describe how something works, and a mechanism outlives any figure produced by it. Because both appear on the same page, a page has no single age, and the useful habit is to read the block rather than the page — and to take anything that will be acted on from the place that owns it.

Two kinds of content on one site

What ages and what does not

Kind of blockRefreshedWhat its date meansConfirm before acting
A measured readingOn a cycleWhen it was capturedYes, always
A description of how something worksRarelyWhen it was last reviewedNot usually
A worked exampleWhen its inputs changeThe moment of the inputsYes, the inputs
Navigation and structureWhen the site changesNothing usefulNo

Two lifespans, one page

A measured block exists to say what something was at a moment. That is its whole value, and it is why such a block carries its own timestamp instead of inheriting one from the page around it. It is replaced on a cycle, and the replacement is not a correction — the previous reading was accurate about its own moment.

A description of a mechanism is the opposite. It says how something behaves rather than what it currently is, and behaviour changes far more slowly than any number produced by it. Such text can sit unchanged for a long time and still be exactly as true as the day it was written.

Mixing the two on one page is deliberate, because a figure without its mechanism is hard to interpret and a mechanism without an example is hard to picture. The cost of mixing them is that the page itself stops having a meaningful age, and that cost is paid by the reader who looks for one.

What a date at the foot of a page actually says

A last-updated line describes the page as a container. It moves when anything inside changes, which means it can move because a single measured block was refreshed while every word around it stayed exactly as it was.

Reading that line as the age of the content is therefore misleading in both directions. It can look recent when the explanation is years old, and it can look old when the figures beside it were replaced this morning and simply did not trigger it.

The reliable date is the one attached to the block that carries it. A measured reading that does not state when it was taken is not usable as a measurement, and a description does not need a date at all, because its claim is not about a moment.

What to re-read and what to leave alone

Re-reading an explanation is almost always wasted effort. Mechanisms change rarely and visibly, and a second reading of the same description produces the same understanding it produced the first time.

Re-reading a measured block is the opposite: it is the only way to know whether the figure has moved, and the answer is often yes. That is what the cycle is for, and it is the reason such blocks state their capture moment rather than hiding it.

The dividing line is simple enough to apply at a glance. If a block contains a figure that could have been different yesterday, its date matters; if it contains a sentence about how something behaves, its date does not.

What this site is not the place for

Nothing here is the record of anything. Descriptions are written to be understood in advance, and measured blocks are readings taken from outside; neither is the account, the platform or the document it describes, and none of them can be.

That is the practical rule that follows from having two lifespans on one page: read the mechanism here, because that is what this site is for, and take any figure that will be acted on from the place that owns it, because that is where its current version lives.

It also sets the limit of a date. A recent timestamp on a description says somebody looked at the wording; it does not say that anything described has been checked against its source today, and no timestamp anywhere could say that.

Reading a page that has two ages

  1. Look at the block rather than the page. A page-level date describes a container and moves for reasons that have nothing to do with the paragraph in front of you.
  2. Ask whether the block contains a figure that could have been different yesterday. If it does, its own date is the one that matters.
  3. Treat a measured reading without a stated capture moment as unusable, because a measurement without a time is not a measurement.
  4. Do not re-read explanations looking for changes; mechanisms change rarely and visibly, and a second reading returns the first one.
  5. Confirm anything you are about to act on where it lives rather than where it is described.
  6. Expect the page date to move when a single block is refreshed — that is what it is for, and it says nothing about the rest of the text.

This describes how the pages on this site are put together. It is general information about the site itself and not advice about trading.

Which date to trust for what

QuestionWhich date answers itWhich date does not
How current is this figureThe capture moment printed beside itThe date at the foot of the page
Has this explanation changedThe page date, roughlyAny capture moment on the same page
Is this safe to act onNeither — check where it livesBoth of them
Why did the page date moveA block inside it was refreshedThe surrounding text, usually untouched

The third row is the one that matters most often: no date on a description page is a substitute for the current state of the thing described.

Frequently asked questions

Does the date at the foot of a page describe everything on it?
No. It describes the page as a container and moves whenever anything inside changes, including a single refreshed block while the surrounding text stayed exactly the same.
Which blocks are refreshed on a schedule?
The measured ones. They exist to say what something was at a moment, they carry that moment beside them, and they are replaced on a cycle rather than corrected.
Which parts of the site are written once?
The descriptions of how something works. A mechanism changes far more slowly than any figure it produces, so that text can stay unchanged for a long time and remain accurate.
Is it worth re-reading an explanation?
Rarely. Mechanisms change slowly and visibly, so a second reading usually returns the first. Re-reading a measured block is the opposite, because that is the only way to see whether a figure has moved.
What should be confirmed elsewhere before acting?
Anything that will be acted on. A description is a description whatever its date, and the current version of a figure lives in the place that owns it rather than in a page about it.
Why does a page have two different ages?
Because it contains both kinds of writing on purpose: a figure is hard to interpret without its mechanism, and a mechanism is hard to picture without an example. The cost is that the page itself has no single age.

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