EngineeringMIT News
Why Roman concrete heals itself
Lime clasts act as crack-healing reservoirs: the “flaw” was the feature all along.
materialsantiquity
6m · 2d agoEverything you save,
finally useful.
Save from anywhereSend Machina a link, a screenshot or a video from any app.
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Ask your libraryPlain-language answers, with citations back to your own saves.
The problem
You never remember where you saved it.
A recipe goes into Instagram saves. A thread gets bookmarked on X. A video lands in Watch Later, and a post disappears into your LinkedIn saves.
Machina
One place. Everything you save.
Machina is a personal knowledge base: send it a link, a screenshot or a video from any app, and months later the thing you half remember is one question away, answered from your own saves with the sources it came from.
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97 saves. One library.
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Shared to Machinanews.mit.edu/roman-concrete
- Fetching the link
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Step 1 of 5: Fetching the link
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Question: What did I save about Roman concrete? Answer: Four saves, one argument: the flaws were the engineering. The article shows lime clasts healing cracks from the inside, the thread explains the hot mixing that made them, and your annotated Pantheon section maps how coffers and graded aggregate let an unreinforced dome stand for nineteen centuries. Sources: Why Roman concrete heals itself; Hot mixing, the missing step; Pantheon section, annotated; The impossible dome.
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Every save is compared against everything you already saved, the moment it lands, so a screenshot of the Pantheon’s section ends up beside the article that explains what it shows, and a half-written note about a deck finds the two saves that answer it.
You never have to build the structure. It is the part nobody keeps up with, and it is the part that makes a save worth having months later. This is the same graph the app draws, assembling itself from the saves on this page.
Your library
A dome, a typeface, an idea, a thread.
This is one person’s library, a few weeks in. Pulled from the web, X, YouTube, Instagram, a screenshot, a note to self. Saves this different usually end up in five different places. Here they sit side by side: every card summarized and categorized, and the whole shelf searchable by what you meant, not just the words you happen to remember.
Engineering
Hot mixing, the missing step
Quicklime mixed hot, not slaked. The chemistry nobody copied for centuries.
materialschemistry
2m · 2d agoEngineering
The Pantheon’s impossible dome
Grading the aggregate lighter with height is what lets an unreinforced dome stand.
domestructures
14m · 4d agoEngineering
Pantheon section, annotated
Load paths sketched over a scanned engraving; coffers cut the dead weight.
domesketch
1m · 1d agoDesignPractical Type
Why serifs survived the screen
Hinting died and retina won: the case for serifs at body sizes again.
typescreens
8m · 3d agoDesign
Letterpress, frame by frame
A wood-type poster from lockup to print, in ninety seconds.
printcraft
1m · 5d agoDesign
The grid behind Swiss design
Müller-Brockmann’s system, rebuilt poster by poster.
gridshistory
16m · 1w agoDesign
Deck: serif body, Swiss grid
Body in the screen serif from that essay; steal the three-column grid from the poster video.
decktype
1m · 1d agoIdeasQuiet Review
The oldest trick in attention
Slot machines didn’t invent variable reward. Newspapers did, a century earlier.
attentionhistory
9m · 4d agoIdeas
Focus is an environment
Not willpower, but a room you design once and get to reuse every day.
focuspractice
2m · 6d agoIdeas
Boredom is data
Mind-wandering is consolidation, and the itch to reach for the phone is the signal.
boredommind
11m · 1w agoBody
Free-diving’s two-minute wall
The wall is CO₂ panic, not oxygen. Training is learning to relax through it.
breathfocus
2m · 3w agoWhere it runs
Wherever you were when you found it.
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