this post was submitted on 25 Jun 2025
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In a First, America Dropped 30,000-Pound Bunker-Busters—But Iran’s Concrete May Be Unbreakable, Scientists Say (www.popularmechanics.com)
submitted 1 day ago by NoSpotOfGround@lemmy.world to c/technology@lemmy.world
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Previously, a yield strength of 5,000 pounds per square inch (psi) was enough for concrete to be rated as “high strength,” with the best going up to 10,000 psi. The new UHPC can withstand 40,000 psi or more.

The greater strength is achieved by turning concrete into a composite material with the addition of steel or other fibers. These fibers hold the concrete together and prevent cracks from spreading throughout it, negating the brittleness. “Instead of getting a few large cracks in a concrete panel, you get lots of smaller cracks,” says Barnett. “The fibers give it more fracture energy.”

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[–] skisnow@lemmy.ca 59 points 1 day ago (2 children)

I suspect the world would be safer if everyone just let Trump think he won.

[–] x00z@lemmy.world 10 points 19 hours ago* (last edited 19 hours ago) (1 children)

That's impossible. "Make America Great Again" is a slogan that he can only abuse as long as there are problems. If he wants to stay in power it's in his best interest to create problems. It's what fascists dictators have been doing since forever. Even if there are no problems they will point towards something and make you think it is a problem, so they can market themselves as the solution. If he would "win" he would lose his power, which is obviously the opposite of what somebody like Trump wants.

[–] noughtnaut@lemmy.world 1 points 4 hours ago

That is depressingly insightful. See also: the internal war on everyone who isn't a middle-aged white cis het man (and even some of them, too). Just negativity all around.

What really brings me down it's the certainty that even if that is guy was suddenly not there anymore, there is a whole gaggle of like folk ready to continue that same rhetoric. How do you even dig yourselves out of that?

[–] davepleasebehave@lemmy.world 3 points 1 day ago

I wonder if Hasbara accounts are pressing this narrative?