Resend of our Tuesday publication.

Last week's trivia detour clearly struck a nerve, so this week we are keeping one foot in weird history and one foot in the actual news.

Building confidence just posted its first real gain in a year, though do not pop the champagne just yet.

And somewhere in the Nevada desert in the 1930s, engineers solved a concrete problem so big it would have taken 125 years to fix itself.

Numbers and nonsense, in equal measure. Let's get into it. 👇

What's hot. What's moving. What you need to know.

The FNB and BER Building Confidence Index gained 2 points to reach 40 in the 3rd quarter of 2026, up from 38 in the previous quarter. It is a small move, but it is the first improvement after 2 consecutive quarters of decline.

For anyone unfamiliar with it, the Building Confidence Index tracks satisfaction with current business conditions across 6 groups: architects, quantity surveyors, main contractors, subcontractors (plumbers, electricians, carpenters, and shop fitters), manufacturers of building materials (cement, bricks, and glass), and retailers of building material and hardware.

Between them, those 6 groups cover the entire pipeline. Architects and quantity surveyors represent the planning stage, material and hardware retailers stand in for renovations and the informal sector, manufacturers cover production, and main contractors and subcontractors represent the actual construction.

The uptick was driven mainly by a marked improvement in sentiment among hardware retailers and quantity surveyors, 2 groups that had been dragging the overall number down for most of the year.

Activity itself told a more mixed story. Some parts of the value chain saw genuine improvement, while others continued to struggle, which is fairly typical of an index moving off a low base rather than a clean recovery.

An index reading of 40 still means the majority of respondents across the building value chain are dissatisfied with current conditions. This is a step in the right direction, not a turnaround being declared.

The residential side has been the weakest link for a while now, and this quarter did not fundamentally change that. The clearer gains are still concentrated in non residential work.

Context matters here too. Earlier in the year the index was knocked around by global uncertainty and rising input costs, so any stabilisation is being read as a genuinely positive signal, even a small one.

Up 2 points, still below halfway. Cautiously good news beats no good news.

So engineers built a giant ice machine and solved it in about 2 years instead.

When the Hoover Dam was built in the early 1930s, engineers calculated that if its 3.3 million cubic yards of concrete were poured as one continuous mass, the heat generated by curing would have taken roughly 125 years to fully dissipate. The stress from that uneven cooling would have cracked the dam apart before it ever held back a drop of water.

Instead of one giant pour, the dam was built as more than 200 separate interlocking column shaped blocks, each one embedded with a network of thin steel cooling pipes before the concrete went in.

River water was circulated through those pipes first, then ice cold water from an onsite refrigeration plant capable of producing around 1,000 tons of ice a day. Between the block sizing and the forced cooling, each section cured in a matter of months instead of decades.

More than 580 miles of pipe were embedded in the structure in total. Once a block had cooled enough, its pipes were filled with grout under pressure and sealed off, becoming a permanent part of the dam itself.

The dam contains enough concrete to build a 2 lane highway from San Francisco to New York, and it is still standing strong more than 90 years later, an early masterclass in solving a materials problem with sheer engineering stubbornness.

There is a popular myth that the dam's concrete is technically still curing today. It is not, the vast majority of the structure finished curing decades ago, but the myth persists because the story is simply too good not to repeat.

Next time a pour on your own site is taking longer to cure than you would like, you now have some perspective on what a real cooling problem looks like.

125 years shortened to about 2, using nothing but pipes, ice, and patience.

Thanks for reading our 14th edition.

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