Today I Learned

[pinball1970]

and this!

T.I.L. Dark Energy alternative ( thought Dark Energy was a done deal?)

https://academic.oup.com/mnrasl/article/537/1/L55/7926647?login=false

Never heard of timescape.

https://www.nottingham.ac.uk/physics/documents/talesoflambda/wiltshire.pdf

 

[Ivan Seeking]

This year I learned you can create fusion in a plasma stream through the "Z-Pinch" Lorentz force created as ions move through their own magnetic field. Reportedly they have hit 800,000 amps in their plasma stream and hope to hit 1 megaamp soon.
https://www.zapenergy.com//

Generally
https://pubs.aip.org/aip/jap/article/127/20/200901/157297

Also, Theta pinch
https://www.helionenergy.com/
https://www.osti.gov/biblio/6559608

In the case of Z pinch, this has been around since the 1950s but they could never control the pinch (as I understand it). But with modern controls and modeling, it may be possible to control this now.

 

[Ivan Seeking]

Oh yes, and Robo Bees are coming to save the crops
https://wyss.harvard.edu/technology/robobees-autonomous-flying-microrobots/

First it was Killer Bees


and now Robo Bees. Next up, Terminator Bees!

 

[Hornbein]

TIL a 2021 University of New Hampshire survey found that 83% of Americans believe the earth revolves around the sun. 19% flat earth, 25% the earth is not billions of years old, 28% microchip implant vaccinations, and 29% no NASA moon landing. But it's not all discouraging. 94% are able to find the USA on a map of the world.

 

[Ivan Seeking]

TIL a 2021 University of New Hampshire survey found that 83% of Americans believe the earth revolves around the sun. 19% flat earth, 25% the earth is not billions of years old, 28% microchip implant vaccinations, and 29% no NASA moon landing. But it's not all discouraging. 94% are able to find the USA on a map of the world.

I just saw that some well-known flat earther went to Antarctica to prove the earth was flat. He argued a 24-hour sun was impossible on a flat earth and disproved his own claim. He thought the claims of a 24-hour sun were fake too! LOL! But I give him credit for being honest. He did actually present his results to his followers!

So you can all relax now. The earth really is spherical. Some influencer says so!

On a related note, the human race is doomed.

 

[Orodruin]

Why Antarctica? That sounds a bit inconvenient when you could just go to northern Canada, Alaska, Greenland, or northern Scandinavia …

 

[Ivan Seeking]

Why Antarctica? That sounds a bit inconvenient when you could just go to northern Canada, Alaska, Greenland, or northern Scandinavia …

I wasn't going to try to understand his "reasoning".

 

[Ibix]

Why Antarctica? That sounds a bit inconvenient when you could just go to northern Canada, Alaska, Greenland, or northern Scandinavia …

Because his assumptions are back to front. He was expecting to go somewhere and film the Sun being below the horizon and ask hard questions of all the paid actors who live locally and lie to the world about it. If he wasn't as near to the pole as he could get, those lying liars who claim to have seen 24 hour sunlight could all claim he hadn't gone far enough south or gone at the wrong time of year or something. Also, most flat-Earthers seem to believe the Arctic is the center of the disc and the Antarctic is the rim, so he'd expect the largest deviation from spherical behaviour there.

It's not a totally stupid experimental design given his idiotic initial beliefs and the challenges he expected to the results he expected.

I've occasionally thought it would be an interesting school project to demonstrate that the world is a sphere. You need cooperation between schools as far apart as possible and phones, and with that the actual measurements are fairly trivial - altitude of the Pole Star and altitudes and compass bearings to a couple of pre-agreed others at a pre-agreed time should be enough to establish your latitude and your longitude difference.

 

[Janus]

Why Antarctica? That sounds a bit inconvenient when you could just go to northern Canada, Alaska, Greenland, or northern Scandinavia …

The Flat-Earth model he accepted allows for a 24 hr sun in the Arctic, but not one in Antarctica. It was based on the Gleason map projection with the North pole at the center of the disk, and Antarctica a ring forming the outer edge. The Sun in this model circled above the disk between the Tropics of Cancer and Capricorn.

 

[Janus]

I just saw that some well-known flat earther went to Antarctica to prove the earth was flat. He argued a 24-hour sun was impossible on a flat earth and disproved his own claim. He thought the claims of a 24-hour sun were fake too! LOL! But I give him credit for being honest. He did actually present his results to his followers!

So you can all relax now. The earth really is spherical. Some influencer says so!

On a related note, the human race is doomed.

Of course, a lot of the Flat-Earth community are now claiming that he is a paid shill. Whether he always was as part of a long con, or just recently bought off is unclear.

This whole thing was an exercise of "The enemy of my enemy is my friend" The person who proposed and funded this trip is a pastor who is a young Earth creationist. He paid for 2 flat Earth proponents and 2 globe proponents to make the trip (others went too, but had to pay their own way). His motive was to separate FE from YEC, as many FEs are also YECs, and he felt that FE made YEC look bad. To my knowledge, none of the globe proponents were YECs, but were willing to take his offer in order to provide further evidence against the flat Earth.

 

[Ivan Seeking]

This year I learned about Suction Specific Speed - a dimensionless number that provides a key bit of information about centrifugal pumps that you cannot derive from the pump curve (at least not in any obvious way).

Industry experience has shown that when the Net Suction Specific Speed has a value less than 6000 ( in US units), the pump is in danger of recirculation or cavitation, and loss of flow. This does require the pump curve is adjusted for viscosity.
https://www.michael-smith-engineers.co.uk/resources/useful-info/specific-speed#:~:text=Industry experience has shown that,in pump wear and maintenance
A closely related equation, the Specific Speed determines the most efficient type of impeller and is based on the net Head at the Best Efficiency Point rather than the Net Positive Suction Head. {NPSH]

 

[DaveC426913]

This year I learned about Suction Specific Speed ...

I forgot the thread title, and thought we awere still talking about Flat Earth, and assumed Suction Specific Speed was going to be the Flerfers' latest rationalization about the Sun's movements.

 

[Ivan Seeking]

This year Last year I learned about salt-cooled fission reactors and other things .
https://www.terrapower.com/
(a Bill Gates company)

On Netflix

 

[jack action]

TIL about windcatchers.

Neglected by modern architects in the latter half of the 20th century, the early 21st century saw them used again to increase ventilation and cut power demand for air-conditioning. Generally, the cost of construction for a windcatcher-ventilated building is less than that of a similar building with conventional heating, ventilation, and air conditioning (HVAC) systems. The maintenance costs are also lower. Unlike powered air-conditioning and fans, windcatchers are silent and continue to function when the electrical grid power fails (a particular concern in places where grid power is unreliable or expensive).

 

[jack action]

TIL

The interesting number paradox is a humorous paradox which arises from the attempt to classify every natural number as either "interesting" or "uninteresting". The paradox states that every natural number is interesting. The "proof" is by contradiction: if there exists a non-empty set of uninteresting natural numbers, there would be a smallest uninteresting number – but the smallest uninteresting number is itself interesting because it is the smallest uninteresting number, thus producing a contradiction.

Furthermore, I also learned that it could be applied to people, thus every person is interesting because the most uninteresting person will always be interesting.

 

[Hornbein]

TIL


Furthermore, I also learned that it could be applied to people, thus every person is interesting because the most uninteresting person will always be interesting.

I rode a train from Turpan to Kashgar. The topography was exactly the same for hundreds of miles. I found this fascinating.

Flying back on the airplane I could see that we had ridden alongside a mountain range that was completely straight and the same height the whole way.

 

[Ivan Seeking]

I rode a train from Turpan to Kashgar. The topography was exactly the same for hundreds of miles. I found this fascinating.

Flying back on the airplane I could see that we had ridden alongside a mountain range that was completely straight and the same height the whole way.

From the North end of Los Angeles to the South end of Orange County, you can drive in solid city for over 100 miles.

 

[Ivan Seeking]

Last year I learned how to make a valve for liquid salt running at over 800 C

 

[BillTre]

From the North end of Los Angeles to the South end of Orange County, you can drive in solid city for over 100 miles.

More so on the east coast.

 

[Ivan Seeking]

More so on the east coast.

Really? I did not know that! In S California it would be solid city from LA to San Diego, but the San Onofre nuclear power plant required a large unpopulated radius. That is shut down now but I haven't been down there for a long time. I don't know if that area is filling in yet or not. They still have 3.5 million pounds of nuclear waste.

 

[BillTre]

Northern VA to Massachusetts at east.
They have a railroad too.

 

[DaveC426913]

What do we define as solid city? Pretty sure I could drive from one end of the Golden Horseshoe (Greater Toronto and burbs) to the other and it would be city the whole way. That's 100 miles.

 

[Ivan Seeking]

What do we define as solid city? Pretty sure I could drive from one end of the Golden Horseshoe (Greater Toronto and burbs) to the other and it would be city the whole way. That's 100 miles.

I meant non-stop buildings, asphalt, and concrete.

 

[Hornbein]

Today I learned that Mormon founder Joseph Smith ran for President in 1844. During that time he was mayor of Navoo, Illinois. Navoo attempted to secede from the Union. It also had an army of 2500 men, one third the size of the US army. This Mormon army destroyed the printing press of some anti-Smithites. This inspired such outrage that Smith invoked martial law in Navoo. Illinois charged him with treason. Smith fled the state but returned when the governor guaranteed his safety. A big mob stormed the jail and killed Smith. He is said to have been the first presidential candidate assassinated.

 

[Hornbein]

jedishrfu : Today I learned that Lagrange was Italian and that he lamented the execution of Lavoisier in France during the French Revolution with the quote:

"It took them only an instant to cut off this head and a hundred years might not suffice to reproduce it's like."

Lavoisier was also the head tax collector of Paris, a very lucrative post. To facilitate the collection of duties on the import and export of goods he had all of Paris surrounded by a wall with customs inspectors at the gates. In my opinion hatred of this was a major cause of the revolution.

In those days it was not unusual for very rich people to become scientists in order to avoid gambling addictions, alcoholism, syphilis, and other common vices of idle hands. Henry Cavendish was perhaps the richest man in England.

 

[Orodruin]

head tax collector

… he certainly had his head collected …

 

[Ivan Seeking]

TIL Spain needs a new flag guy

 

[DaveC426913]

I meant non-stop buildings, asphalt, and concrete.

OK, yes. That describes the Golden Horseshoe.

I think Canada is laid out a bit differently than America. We bunch all our urban areas together.

And most of us huddle as close as humanly possible to the border where there's warmth.

1/4 of all Canadians (40m) live in the Golden Horseshoe (9.7m).

 

[jbriggs444]

During that time he was mayor of Navoo, Illinois.

Nauvoo

 

[jack action]

OK, yes. That describes the Golden Horseshoe.

I think Canada is laid out a bit differently than America. We bunch all our urban areas together.
View attachment 355389

And most of us huddle as close as humanly possible to the border where there's warmth.

1/4 of all Canadians (40m) live in the Golden Horseshoe (9.7m).
View attachment 355390

To really leave an impression, this map does the trick: