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happytoes
Member for: 4.2 years

scp: 743 (+776/-33)
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votes given: 2450 (+2403/-47)
score: 1068





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2
Emulating biology to make tiny robots     (www.youtube.com)

submitted by happytoes to technology 1 year ago

0 comments

The author starts making a tiny robot and gets frustrated that the smallest roller bearings he can buy are bigger than he wants. He investigates rolling contact/compliant joints, and starts over. But first he makes this video, 3D printing a giant version of the rolling contact joint so that you can see how it works, and how to thread the string.

Is this the right tech for finger joints for robot hands?
0
Jenna Ortega teaches U-substitution in under 90 seconds     (www.youtube.com)

submitted by happytoes to mathematics 1.1 years ago

1 comments

Mildly amusing use of AI impersonation, competent mathematics, short!
2
The Lancet still hasn't retracted the PACE trial for ME/CFS     (www.youtube.com)

submitted by happytoes to science 1.1 years ago

1 comments

I've been impressed by the blogger, Pete Judo, and his coverage of the replication crisis. Here he explores a well funded study that is so shoddy there is nothing there for a replication attempt to try to replicate.

I'm so old that I remember when the television program [Tomorrow's World](https://en.wikipedia.org/wiki/Tomorrow%27s_World) was hosted by Raymond Baxter. Science reporting then was all about the wonders that science would provide. Now-a-days, science bloggers have no choice but to report the latest juicy scandal.
4
Why did Nikita Khrushchev Give Crimea to Ukraine?     (www.youtube.com)

submitted by happytoes to History 1.1 years ago

4 comments

Short answer: we don't know.

Interesting history: Crimea was its own little Soviet Socialist Republic from 1921 until 1945, then part of the Russian one until 1954, when Khrushchev meddled.

On a personal note, Alfred, Lord Tennyson's poem, [The Charge of the Light Brigade](https://www.poetryfoundation.org/poems/45319/the-charge-of-the-light-brigade) was popular when I was a child. But now I'm grown up, nobody in the UK seems to remember that Crimea was part of Russia, back when Britain and France invaded Russia to help the Ottoman Empire. I don't get how "Crimea was part of Russia" has disappearred down the memory hole, when there was a catchy poem to anchor the memory. Normal people seem weirdly trapped in an eternal present of what the TV just told them.
1
Aftertaste     (www.oglaf.com)

submitted by happytoes to funny 1.1 years ago

3 comments

This particular cartoon is suitable for all ages and work places, but the website is not.
3
What did Hamza do for Dundee?     (www.youtube.com)

submitted by happytoes to Scotland 1.1 years ago

1 comments

This video comes from a fringe political party https://homelandparty.org

It is unashamedly nationalist https://homelandparty.org/our-thinking/nationalism-explained/

Its policy pages are a little light.

"Environment" is mostly pro-farmer. Which is correct globally, but awkward for crowded island that has traded manufactures for food for centuries.

"Community Care" relies on picking the fruit of the magic money tree. My understanding is that life-span = health-span + grim-span and that recent medical progress has been adding three years to the grim-span for every year that it adds to the health span. Ignore that and the magic money tree will be plucked bare and die :-(
1
The shocking connection between complex numbers and geometry.     (www.youtube.com)

submitted by happytoes to mathematics 1.1 years ago

0 comments

Starts by explaining meromorphic functions with pretty colored pictures. Moves on to parameterizing a circle with sine and cosine. Then it moves in for the kill, trying to rupture cerebral aneurysms by parameterizing the complex torus with the Weierstrass P functions just like it did for the circle. But instead of x^2 + y^2=1, it is y^2 = 4x^3 + 4x, an elliptic curve.
1
Peter Murrell charged with embezzlement in SNP finance probe     (www.bbc.co.uk)

submitted by happytoes to Scotland 1.2 years ago

0 comments

0
Great Moments in Unintended Consequences: Gun Buybacks, Poppy Payday, CAFE Standards (Vol. 13)     (www.youtube.com)

submitted by happytoes to videos 1.2 years ago

0 comments

Exemplary video, crisply making its points. Three examples of unintended consequences, three minutes video = one minute per info nugget.

Also exemplary for what isn't there: I didn't have to sit through three minutes of pejorative adjectives against political opponents before getting to the point.
13
R.I.P. The Scottish Enlightenment 1697-2024     (marginalrevolution.com)

submitted by happytoes to Scotland 1.2 years ago

5 comments

Marginal Revolution links to https://dailysceptic.org/2024/03/20/r-i-p-the-scottish-enlightenment-1697-2024/
and has many comments bashing the Scottish Government for the oppressive speech law, due to come in on 1st April
0
The Power of Education     (www.oglaf.com)

submitted by happytoes to funny 1.2 years ago

0 comments

11
SNP government forced to publish 100 pages of WhatsApps it claimed didn't exist     (www.scottishdailyexpress.co.uk)

submitted by happytoes to Scotland 1.3 years ago

2 comments

Perhaps this https://www.thescottishsun.co.uk/news/12295133/snp-chiefs-release-106-pages-whatsapp-messages/ is a better link.
2
Scotland's drug deaths soar by 10% as critics blast SNP Government for 'well-meaning' words     (www.scottishdailyexpress.co.uk)

submitted by happytoes to Scotland 1.3 years ago

0 comments

In 2023, 1,197 people died as a result of suspected drug use – up by 105 from 2022.

0
How Henri Moissan isolated Fluorine in 1886     (www.youtube.com)

submitted by happytoes to science 1.3 years ago

0 comments

In just 4'52" this video explains why isolating Fluorine is a hopeless quest, and gives technical details of the brilliant innovations that let Henri Moissan succeed.
3
Nicola Sturgeon reported to Met Police over her deleted WhatsApp messages     (www.scottishdailyexpress.co.uk)

submitted by happytoes to Scotland 1.3 years ago

1 comments

Silver Fox Hot Take: https://www.youtube.com/watch?v=o1FEaAAqXJk
16
FBI informant arrested for claiming Biden took bribe from Ukrainian energy company     (rumble.com)

submitted by happytoes to news 1.3 years ago

7 comments

2
Ceasar Cui Waltz Op 31 No 2 E Minor     (www.youtube.com)

submitted by happytoes to Classical_Music 1.3 years ago

2 comments

*The mighty handful* was a group of five prominent 19th-century Russian composers who worked together to create a distinct national style of classical music [source](https://en.wikipedia.org/wiki/The_Five_(composers%29). They were
Balakirev (best remembered for [Islamey](https://www.youtube.com/watch?v=YXPeZUZkRuc)), three still prominent: Mussorgsky,Borodin, and Rimsky-Korsakov. And the fifth one, no-one remembers: [César Cui](https://en.wikipedia.org/wiki/C%C3%A9sar_Cui). I don't think that I've ever heard his music until today.

I enjoyed this flowing, lilting waltz and have [found the score on IMSLP](https://imslp.org/wiki/3_Valses%2C_Op.31_(Cui%2C_C%C3%A9sar%29). I might have a go at playing it myself.

Perhaps Cui is neglected because, as an engineering professor and military general, as well as being a composer, he is just too bad-ass for the small men of today to admit that he even existed.
8
The Real Reason Jimmy Savile Was Never Caught     (www.youtube.com)

submitted by happytoes to UnitedKingdom 1.4 years ago

2 comments

Short answer: He was a procurer. Ten minute excerpt from a longer video https://www.youtube.com/watch?v=B4v7AnxCNxA
3
The South African pothole     (www.youtube.com)

submitted by happytoes to FunnyVideos 1.4 years ago

1 comments

Yet another David Attenborough paraody.
6
Scientific Misconduct and Fraud: The Final Nail in Psychiatry’s Antidepressant Coffin     (www.counterpunch.org)

submitted by happytoes to science 1.4 years ago

0 comments

This story caught my eye for a different reason from the scientific fraud narrative.

What do we mean when we say that drug A is better than drug B ? Using "drug A" and "drug B" as names clashes with English grammar. In the interests of euphony, I've used a name generator and will call them Aproxin and Benzolax. Here are three different things that we might mean when we say that Aproxin is better than Benzolax because Aproxin works for 40% of patients, but Benzolax only works for 30%.

First meaning: Independent. Some lucky folk respond well to both 0.4 x 0.3 = 12%. Some patients (0.4 x 0.7 = 28%) only respond to Aproxin. Others (0.6 x 0.3 = 18%) only respond to Benzolax. Many (0.6 x 0.7 = 42%) benefit from neither.

Second meaning: Dominant. Hope that you are one of the 40% who respond to Aproxin. That forty percent splits into three quarters who also respond to Benzolax, and one quarter who don't respond to Benzolax. Notice the cunning with which I have contrived the numbers in my made up example. That is all of the 30% who respond to Benzolax accounted for. No-one responds to Benzolax and not to Aproxin. 60% of patients are out of luck. Obviously you try Aproxin first. If it doesn't help, give up. Benzolax has found itself in a context in which it is entirely useless.

Third meaning: Sequential. Weirdly, no-one responds to both drugs. You try Aproxin first. If it doesn't work, you move on to Benzolax. Notice how this messes with the numbers. If 40% respond to Aproxin, that leaves 60% moving on to Benzolax. Half of those who try Benzolax (under this treatment protocol) benefit. That is 50%, up from the 30% who benefited in the old days before Aproxin was discovered.

Notice how the discovery of Aproxin affects the sales of Benzolax. In the Dominant case, Benzolax becomes obsolete. In the Sequential case, a superficial reading/misunderstanding of the numbers makes it look as though the discovery of Aproxin makes Benzolax work better.

So how do you compare drugs? I've noticed that trials generally do a naive random assignment. You get numbers for the effectiveness of each drug as though the other drugs didn't exist. But how do the medicines relate? Independent? Dominant? Sequential? Not one of the extreme cases? The trials don't say. But it does matter for treatment.

At the heart of the article is STAR*D, Sequenced Treatment Alternatives to Relieve Depression https://ajp.psychiatryonline.org/doi/epdf/10.1176/ajp.2006.163.11.1905 Some-one has actually gone ahead and tried to measure what happens when you try drugs in sequence. They cheat which is the usual money grubbing of modern science. On the other hand, that are looking at the medically important comparison, which is progress.
2
Radu Lupu plays Brahms - 3 Intermezzi, Op. 117     (www.youtube.com)

submitted by happytoes to Classical_Music 1.4 years ago

1 comments

1971 recording. Beautiful tone. A little slow. I would love to learn to play these three pieces myself. So Radu Lupu's performance is reassuring: there is no need to rush, despite Brahms writing No 2 using lots of demi-semi-quavers. The technical challenge of No 1 is that the right hand has to play the tune with the middle fingers while playing accompanying octaves with the thumb and little finger. Radu Lupu is inspiring to me; not only is this is really possible, he shows that it is very easy :-)
0
Digging up a Nicola Sturgeon scandal from 2010     (caltonjock.com)

submitted by happytoes to Scotland 1.4 years ago

0 comments

This blog post is about her pleading for leniency for fraudster Abdul Rauf.

I followed the link from a youtube video https://www.youtube.com/watch?v=JvUE7X-2mjY titled "SNP Nicola Sturgeon has a very dubious past. This is old news but not widely known."

I'm more interested in the blog itself Caltonjock https://caltonjock.com/ which seems to be active and busy digging into the details of Scottish politics.
5
Sounding the Sumburgh Foghorn     (www.youtube.com)

submitted by happytoes to Scotland 1.5 years ago

1 comments

> Out of use since 1987, the foghorn was painstakingly restored by Brian Johnson. Shown in the video is the annual Foghorn sounding at Sumburgh Lighthouse, Shetland, Scotland. Brian starts up the 1951Kelvin K-Series Diesel 44hp Engines. The engines power the Alley and MacLellan compressors, which in turn, power the foghorn.

I am old and cannot resist the nostalgia of chunky old machinery, which this short, skillfully edited video, shows off beautifully.
5
Murray Rothbard catches a glimpse of what is going on, in 1993     (twitter.com)

submitted by happytoes to whatever 1.5 years ago

3 comments

10
Planetary Roller Screws     (www.youtube.com)

submitted by happytoes to Machining 1.5 years ago

4 comments

I've got a small manual lathe that I bought second hand. My father taught me the technique of taking up backlash. When you need to move the top slide out, to increase the diameter of the cut, move it too far, then screw it in to the required setting. This ensures that every setting is set pushing the top slide in. This technique works, but is annoying. On a worn old lathe it is essential.

But how does modern CNC machinery work? It seems to zip back and forth by turning the lead screw, with out regard to backlash. I think there was a short era of using two nuts, held apart by a strong spring that both takes out the backlash and creates lots of friction. Then came recirculating ball screws. The rolling of the ball bearings solves the problem of friction. Accurate manufacturing of the ball race helps, and finally backlash is eliminated by having the nut done up tight.

Then I saw this video, which looks like it is the next stage, with all the baby thread rollers rotating around the lead screw. They claim repeatability of 0.006mm. I guess this is the possible error between screwing in and screwing out to your setting. I'm not involved in this technology, I just like to watch and keep up to keep in touch with how things work.