Your video, Concrete Patch Schadenfreude, has made it into the Top 15 New Videos listing. Congratulations on your achievement. For your contribution you have been awarded 1 Power Point.

I'm a structural enginerd...I have years of prestressed concrete experience. I agree with this video. Post tension failure hit my brain as soon as I saw the video. Sudden loss of strength. PT concrete without PT = unreinforced concrete = sudden loss of strength = brittle failure. However, the PT cable could have been made of subpar materials. I once broke a #6 rebar with one hand in front of the Owner, inspector, and Contractor! Regardless, the PT rod was likely at yield when it was being tightened. As soon as it reached Fu...boom. What goes through the brains of the guys tightening a PT rod and notices the cable doesn't take load!

A minor point...porous asphalt is only briefly mentioned. The video spends some 90%+ of its time explaining porous concrete, which except for the embedded plastic is a fairly obvious concept. I still have no idea how porous asphalt could work...I'd think the tar would make it pretty watertight.

I didn't dismiss it. I stated what he provided and implied it was inadequate.

I literally just wrote that there are opposing papers. I hope you don't think putting opposing papers up is some sort of "gotcha" moment.

"Are you calling them liars?"

No. Are you calling the authors of the papers I've put up liars? I'm sure you can see how silly a question that is now it's put back at you.

"We find that the buyback led to a drop in the firearm suicide rates of almost 80%"

I haven't been talking about suicide - but if you must then yes, it dropped the suicide by firearm rate. I never contended otherwise.

"The effect on firearm homicides is of similar magnitude but is less precise [somewhere between 35% and 50%]"

43% variance is large. The reality is the data isn't very good (as multiple studies have pointed out) and it makes it very hard to measure, analyse, and draw appropriate conclusions.

"NFA seems to have been incredibly successful in terms of lives saved."

Note the language, "seems to have". They aren't affirming that it has because they probably can't back it up with solid data.

"The NFA also seems to have reduced firearm homicide outside of mass shootings"

Again, non-concrete affirmations. The same data sets as analysed by multiple other studies points to no change in the rate. Are any of them liars? I doubt it.

I believe the McPhedron paper is one of the most important, illustrating that some of the key legislative changes had no effect when comparing it to our closest cultural neighbour who didn't legislate the same changes (and maintained a lower overall average homicide rate and lower average homicide by firearm rate for the last 20 years).

As I already wrote, it's a contentious issue and there are opposing papers on this topic.

One of the two of us has a paramedic degree and worked as a paramedic... I spent 3 years at university learning what and how things make holes in people and how to plug them up and keep them alive.

So yes. I'm serious.

The barricades are an interesting point. The movable concrete blocks don't stand up to small trucks or larger. Large steel bollards on the other hand will stop everything bar a tank.

@bobknight33

mueller finding evidence of russian collusion during the campaign?

yeah..you are probably right.still have yet to see concrete evidence,just a lot of circumstantial pearl clutching.

however..

there IS a lot of evidence,and growing larger by the day of trump colluding with the russian government and russian oligarchs to:
illegally launder money from russia.
tax evasion with the help of russian banks.
and a ton of hanky panky money exchanges to cover that all up.

which of course is not really news.
if anybody had bothered to pay attention trump has been mobbed up for decades.

david cay johnston has been exposing trumps corruption for quite awhile.

The video is right that pretty much the number one most important question is the weight of the truck (basically tare weight, which is actually the tractor plus empty trailer). When I watched the announcement, I thought Musk was slightly cagey about that, but I thought that he said that it would be in the ballpark of a normal ICE semi. Guess I should watch again.

I think Musk made some semi-optimistic predictions about battery tech improvement and economy of scale. Frankly, I think he's earned the right to be semi-bold with his predictions, given his and Tesla's track record (paying off govt. loan very early, single handedly pushing forward battery tech and production, etc. etc.). His optimistic predictions have a tendency of panning out.

The average American is never going to switch to an electric car purely or even largely for "green conscious" reasons. The switch will happen when the electric car is better than the ICE alternatives in concrete metrics like performance, reliability, and operating cost. Musk is pushing that date forward at an incredible pace. Arguably it is already true for many use-cases at the high price-point range of the Model S, but that price point limits the scope of the impact quite a bit. He knows that to really shake things up, he's got to get that price point down, and he knows that to do that he's got to improve the economy of scale on battery tech. Which he's doing by expanding it into adjacent markets like home batteries, etc.

I think he deserves a lot of credit for "walking the walk" when it comes to working hard to protect/improve the environment, as opposed to Al Gore et al. "talking the talk".

But that stuff isn't aerated to the point that you can dunk someone under the sand. This stuff would be easily inhaled. I've seen aerated concrete powder kill a guy before. Coroner said his lungs were so hard you could stand on them.

https://democracyjournal.org/arguments/keep-it-simple-and-take-credit/

"Implementing these kinds of policies are also no road to electoral success. Peoples’ lives are hard enough without tax credits and savings accounts and eligibility forms and government phone calls that determine whether one’s household income puts one in the bracket for this or that plan or benefit or subsidy and on and on. No voter is thanking anyone who puts them on this road, even if there’s a small pot of money at the end of it.

And forget the annoyance—the amount of immense mental energy and social capital required to keep track of, comprehend the eligibility requirements of, and then successfully apply for these benefits is a de facto regressive tax on people whose lives are too materially difficult to deal with arcane bureaucratic bullshit. That is, those people that need the help the most.

So what to do? No more savings accounts, no more cleverly hidden help that people won’t even notice, no more tax-preferenced, means-tested, government-monitored, website-reliant, bronze/gold/platinum-benefits-so-long-as-you-apply-during-open-enrollment. Just give people the stuff they need.

This shouldn’t even be a liberal-socialist divide, although it seems to have become one in recent years. When society decided citizens should be able to read, we didn’t provide tax credits for books, we created public libraries. When we decided peoples’ houses shouldn’t burn down, we didn’t provide savings accounts for private fire insurance, we hired firefighters and built fire stations. If the broad left takes power again, enough with too-clever-by-half social engineering. Help people and take credit."

As Lambert Strether of Corrente says: universal, concrete, material benefits.

Good piece in the Nation on the current state of Russiagate.

Appetizer:

These imperatives have incentivized a compromised set of journalistic and evidentiary standards. In Russiagate, unverified claims are reported with little to no skepticism. Comporting developments are cherry-picked and overhyped, while countervailing ones are minimized or ignored. Front-page headlines advertise explosive and incriminating developments, only to often be undermined by the article’s content, or retracted entirely. Qualified language—likely, suspected, apparent—appears next to “Russians” to account for the absence of concrete links. As a result, Russiagate has enlarged into a storm of innuendo that engulfs issues far beyond its original scope.

There was a show, islands of the future, on Netflix now, that had a large scale demonstration and explanation of it, used to store wind energy and power an island.
Unfortunately, I don't know of a comparison with batteries with concrete numbers.
I think you hit the nail on the head with what you said about efficiency, but for large scale storage, it has to be better when you factor in the energy costs of making, replacing, and disposing batteries, even including the cost of replacing the turbines.
...and all that ignores the ecological issues, where ponds beat battery factories hands down.

Hadn't heard of that, but I get the concept. Cool idea.

Off the top of my head, I'm concerned about pump and generator efficiency. You're going to use some amount more energy to pump a volume of water up to the high basin than you will get back by gravity feeding it through generators. To be fair, efficiency is a problem with using and recharging chemical batteries as well, but the limited amount that I remember from college engineering courses tells me that efficiency in the electrical / solid state world tends to be more easily obtained than in the mechanical world.

And as another "to be fair", efficiency is a bigger concern for things like fossil fuels, where burning one unit of fuel produces a set amount of energy and you have to improve efficiency to get the most value out of that energy. With things like solar and wind being "free" energy when active but requiring storage for when the source is inactive (night / calm winds), efficiency still certainly matters, but not as much as with a scarce / non-renewable source of energy.

Anyway, I'd like to see concrete numbers comparing the utility and efficiency (in various metrics) of your hydro storage vs battery storage.

@bobknight33

Are you happy?

Can you name one concrete thing Trump's done (I mean actually accomplished, not just said) that makes you happy?