SteamyTea

Until the yield point is reached, it is really just differential thermal expansion (in a fire situation) that causes the buckling point to me lower. So what may be fine at 50°C, may have problems at 75°C even though it is well below the critical temperatures of the material, due to the change is sizes (expansion) in 3 dimensions. This can be made worse if 2 of the 3 dimensions are fixed in place. Think of a beam that is rigidly fixed at each end and has a weighty slab on it. When it heats up, there is only two degrees of freedom, one downwards and the other sideways. A bad design would not take those small movements into account, a good design would, and know which way it would ultimately fail. Another way to think of it is removing a few bricks from the base of a tall chimney. Each individual brick does not carry much load, so removing it cannot do any harm!

Maybe the 900 GJ of chemical energy per plane had something to do with it. That is about 200 tonnes of TNT. And that is before the kinetic energy of the impacts. About 200 MJ, about 50 tonnes of TNT.

Seems we all do. Maybe the electrodes on @Pocster's nads will prove it to the doubters. Babies are born with the neural foundations for maths Brain recordings from newborns reveal the first neural evidence that humans are born with an innate sense of numbers By Helen Thomson 30 June 2026 We are born with an understanding of numbers, which has probably given us a huge evolutionary advantage Marc Calleja / Alamy Babies are born with an innate sense of numbers, and now the brain mechanisms behind this ability have been identified for the first time. Within days or even hours of being born, a group of babies could distinguish between four and 12 stimuli, with their brain activity showing how this rudimentary sense of numerosity is in place. “Extracting numerical information from the environment is just like seeing the world in colour, for most people,” says Brian Butterworth at University College London, who wasn’t involved in the research. By which, he means that having a sense of numbers is part of our essential “start-up” toolkit. Just as you look at a bowl of pears and perceive them as green without having to reason, the brain is also primed to extract an approximate quantity from a scene. Marco Buiatti at the University of Trento in Italy and his colleagues wanted to examine the brain mechanisms that support our innate sense of numbers, which isn’t acquired through language or culture. They fitted 21 newborns aged between 0 and 3 days old with an EEG cap containing sensors that monitor electrical activity across the brain. Studying cognition in newborns isn’t easy, says Buiatti. “They open their eyes for a minute or two, and that’s all. It’s complicated and slow, but so rewarding when we get results.” During moments of alertness, the babies listened to a 90-second recording of a voice repeating sounds, arranged in groups of either four or 12 syllables. “Something like: la, la, la, la,” says Buiatti. The researchers simultaneously showed the babies a visual stimulus containing either four or 12 dots, for up to 50 seconds. They found that electrical activity in the babies’ parietotemporal area – which perceives and organises sensory information – decreased when the number of dots matched the number of syllables being spoken, but not when an incongruent number was displayed. This fits with what is known about the adult brain. When we sense a repeated stimulus, our brain reduces its response to it in an adaptive process known as repetition suppression. This allows the brain to work more efficiently, without having to process every repeated input as if it were new. When a mismatched number of dots was presented to the babies, their neural activity rose. “Seeing a new number of dots releases the brain from this adaptation effect,” says Buiatti. “It’s the first time we’ve shown a neural mechanism for this innate sense of number.” This innate ability has clear evolutionary value, he adds. The rapid ability to distinguish between one and many predators, or one and many food items, say, would have given an important survival advantage. We also know that a child’s number sense at 1 year old predicts their maths skills several years later. Understanding the brain mechanisms involved in this sense may help researchers identify children at risk of dyscalculia (a learning difficulty that affects a person’s ability to understand, recall or use numerical information), says Buiatti. “Studying the neural implementation of number sense at birth is important because it is the basis for the development of higher math functions later on, and with further research this result could help in the designing of an early neural biomarker of the risk of developing dyscalculia,” he says. Reference: bioRxiv DOI: 10.64898/2026.05.08.723896

So was Nerys Hughes

Can you explain a bit more. I assume it is exposed surface area that needs to be reduced or protected.

There is a great documentary about RP. One of the contractors still found it funny how they got paid more to put less bolts in. Wankers. Wish I had known that was a 'thing when I was studying engineering. It would have been a hard sell in some companies I have work for, but the opportunity to build models and then destroy them would be great.

As long as you understand this lot, you are nearly there. Where is our Latin American @Gerard, he knows his sums. Wonder how he is getting on in the Paris heat.

I worked for an American company in the 1970s and very early 80s, the paperwork traceability was excellent, any amendments where logged. When the service engineers visited sites, they only took the parts that were need for the individual machine. This saved a fortune on servicing (import taxes on spares where a big thing back then). I would not be surprised if there were updated drawings. At the end of Raiders of the Lost Ark, the Ark gets put into a wooden chest and filed away in a Naval base. That was American irony, and nicely done.

Not sure but it may be to do with condensation aliveation.

I think the fibre matrix is made from polyester. So think of it as a very dusty blanket that has been gathering dirt at your grandmother's for the last 60 years. Then think about what is sticking to it, and why it does not bend tight to make a good hospital corner. Sleep well in this heat everyone

Ah, the Register; Who Me

@DamonHD had a similar product fitted a few years back. It is worth noting that insulation is an inverse square law by thickness. If say 5mm reduces the losses by x, doubling the thickness to 10mm will reduce the total losses by x + x/2. 3 times the thickness, x + x/2 + x/8, and so forth.

Lots of data here. https://www.ukgridlive.co.uk/

Is it worth it, the k-value is not much better than PIR. Spacetherm is not real aerogel, it is, as far as I know, fumed silica in a blanket.

Lumberjack

Usually, polymer manufactures keep to what they know. The properties are probably very similar to the paints in the rest of their range. The three things most likely to change are the surface tension additive, the pigment/dye and the etching agent additive. The rest will be the same. Buy a pot and give it a go.

Voodoo

You need to consider your vapour control layer (VCL) at this stage.

Better off getting an air blower to test for leaks as you go along. You can make one with a large fan and a manometer. A simple IR thermometer will tell you most of what you need to know about cold bridges.

It's the webbed feet.

Women with stilettos on it.

Even a bit of miss sized walk on glazing would not do that.

Toughened glass often has tiny impurities in it. These set up a stress raiser. Then they can just shatter with seemingly not reason. I had sold my car, went out in it the day before the guy was to pick it up. Driving down an empty road the windscreen shattered. Cost me 50 quid. I should have stayed in.

Made hundreds. What timbers (note plural) are you intending to use? White Pine or Teal where our choices for panel saunas and Abachi for the benches. (I have a sauna controller cluttering up the place still, been in a box for over 30 years)