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Wednesday 30 September
1 · The text
The complaint that life is too short
Nature is not stingy, Seneca tells his friend Paulinus: a great fortune handed to a bad master is gone at once, a small one in good hands grows.
2 min · Seneca · Minor Dialogues, Together With the Dialogue on Clemency · tr. Aubrey Stewart · 1889 translation · public domain
The greater part of mankind, my Paulinus, complains of the unkindness of Nature, because we are born only for a short space of time, and that this allotted period of life runs away so swiftly, nay so hurriedly, that with but few exceptions men’s life comes to an end just as they are preparing to enjoy it: nor is it only the common herd and the ignorant vulgar who mourn over this universal misfortune, as they consider it to be: this reflection has wrung complaints even from great men. Hence comes that well-known saying of physicians, that art is long but life is short: hence arose that quarrel, so unbefitting a sage, which Aristotle picked with Nature, because she had indulged animals with such length of days that some of them lived for ten or fifteen centuries, while man, although born for many and such great exploits, had the term of his existence cut so much shorter. We do not have a very short time assigned to us, but we lose a great deal of it: life is long enough to carry out the most important projects: we have an ample portion, if we do but arrange the whole of it aright: but when it all runs to waste through luxury and carelessness, when it is not devoted to any good purpose, then at the last we are forced to feel that it is all over, although we never noticed how it glided away. Thus it is: we do not receive a short life, but we make it a short one, and we are not poor in days, but wasteful of them. When great and kinglike riches fall into the hands of a bad master, they are dispersed straightway, but even a moderate fortune, when bestowed upon a wise guardian, increases by use: and in like manner our life has great opportunities for one who knows how to dispose of it to the best advantage.
2 · One idea · Physics & information
Entropy
Drop an ice cube into a warm drink and wait. It melts, the drink cools a little, and it never goes back.
No law of motion forbids the reverse. Every molecule could, in principle, retrace its steps. It is just that there are overwhelmingly more ways for the heat to be spread out than gathered in one cube.
That count of possible arrangements is entropy. Rudolf Clausius coined the word in 1865, from the Greek for transformation, and it is the reason your desk gets messy on its own but never tidies itself.
In one line. Entropy is a measure of disorder, and physics says it always increases in a closed system. As a mental model, it captures the universal tendency for things — rooms, organisations, relationships — to drift toward disorder unless energy is continually spent to maintain order.
Worked example
A clean kitchen doesn’t stay clean — left alone, it gradually fills with clutter and grime. Keeping it ordered takes constant energy (cleaning); the disorder is free and automatic. The same drift afflicts every organised system.
How to use it, and where it fails3 · One number
Children per woman, world
19504.85
20232.25
2.2 times lower than in 1950.
Around 2.1 is the level at which a population replaces itself without migration.
Source: Our World in Data, world estimates, read 2026-09-24.