Witness Andrew Neil being awesome

Well said, that man.

Originally shared by BBC News

Andrew Neil has delivered an opening monologue in response to the Paris terror attacks on BBC's show This Week. #parisattacks
https://www.youtube.com/watch?v=WIKg3Qexn7U

Science at the heart of government

"A government-commissioned review says UK science funding should be determined by a single independent agency. It argues this body should liaise with a committee of ministers, chaired by a senior cabinet figure."

"The review has been produced by one of the country's most respected scientists, Royal Society president Sir Paul Nurse. He says the aim of his proposals is to put science "at the heart of government"."

Yes, but government is not supposed to be at the heart of science ! Otherwise you really will get a false, politically-motivated consensus developing.

"in return for science having a more prominent role in government and society..."
Yes, good....
" offer ministers an opportunity to discuss funding directly with scientists".
Lord no. That's what research councils are supposed to do, at least as far as is humanly possible : prevent politicians having direct control over research. You'll never have a publically-funded system entirely free of political influence, but you can certainly restrict it.

[I'm not so sure about this one any more. Yes, politicians shouldn't influence scientists, but as long as the flow of information is the other way, this can be very valuable.]

"He himself admitted that this could be perceived as "doing a deal with the devil George Osborne", but said that his proposed reorganisation would be good for research and good for society."
Making science a bigger part of politics and society in general is great. But if the price is making politics a bigger part of science, then the price is too high.

Also :
http://astrorhysy.blogspot.cz/2015/11/when-worlds-collide-science-in-society.html
http://www.bbc.com/news/science-environment-34860952

Terrorism in perspective

Perspective

This chart of how terrorism in Europe is generally declining is floating around my stream. While the decline is important, I think it's also important to realise just how incredibly rare terrorism is anyway. I don't want to make any comment on the importance of counter-terrorism activities in keeping this number low, only to point how that from an individual sense, fearing death by terrorism makes no sense whatsoever.

The graph of terrorist killings below comes from http://fivethirtyeight.com/features/the-rise-of-religiously-inspired-terrorism-in-france/
I did not re-extract the original data, I simply used the graph provided.

The data for drowning comes from http://ec.europa.eu/eurostat/
Only data for 2011-2012 is available; the EU does not, so far as I know, have a longer-established central statistics database. As far as I am aware this data is only for European residents, not for those who die while trying to reach Europe. In the UK at least, the number of drownings per year has remained pretty constant, so although there will be some variation, the numbers probably won't be dramatically different in 1970.

Other causes of death from Eurostat :
Transport - 35,000
Falls - 45,000
Unknown - 79,000. Yes, apparently there are 79,000 annual deaths in the EU that simply go unexplained or have "ill-defined" causes.
Pregnancy : 200-300.

So statistically, terrorism is only slightly more dangerous than getting pregnant. It's not even remotely as threatening as a trip to the seaside (though eurostat doesn't give details on how many drownings occur in lakes, rivers, swimming pools etc.), is completely and utterly negligible threat compared with getting in a car or being near a road, or falling over, or even compared with dying from unidentified causes.

Science in society

Science isn't an art, but it does need (almost) the same level of freedom of the arts. Science isn't journalism - it needs to search for the truth, but it's not supposed to be impartial. Nor is it a business, but competitiveness is a valuable part of the process. And while politics should be kept out of science, science should definitely not be kept out of politics.

Don't let them win

The hypocrisy of austerity

It's not the most important news story of the day, but it is important.

"David Cameron privately lobbied to stop the closure of police stations in his constituency as the force tried to find £60m of savings, the BBC has learnt. The disclosure has prompted Labour to accuse him of "jaw-dropping hypocrisy". Number 10 said Mr Cameron had acted in his capacity as a local MP who believed Thames Valley Police could make savings without affecting front-line services."
http://www.bbc.co.uk/news/uk-politics-34815792

Xenophobic scientist is xenophobic

"Recently, German scientist Gangolf Jobb declared that starting on October 1st scientists working in countries that are, in his opinion, too welcoming to immigrants — including Great Britain, France and Germany — could no longer use his Treefinder software, which creates trees showing potential evolutionary relationships between species. He’d already banned its use by U.S. scientists in February, citing the country’s “imperialism.” Last week, BMC Evolutionary Biology pulled the paper describing the software, noting it now “breaches the journal’s editorial policy on software availability.”"

There is absolutely no lower limit on stupidity, even for very intelligent people.
http://retractionwatch.com/2015/11/11/bmc-retracts-paper-of-scientist-who-banned-use-of-his-software-by-several-countries

Bruno Maddox and the Magnet: A Story of Misconceptions

Originally shared by Jonah Miller

Bruno Maddox and the Magnet: A Story of Misconceptions

The ever-inquisitive Gary Matthews  pointed me to a 2008 article by Discover Magazine's Bruno Maddox (see: http://discovermagazine.com/2008/may/02-three-words-that-could-overthrow-physics), claiming that physicists cannot explain how magnetism works, and that they are in denial about it. I encourage you to read the article. Maddox is wrong—dead wrong—but his argument displays a number of common misconceptions about science. And I’d like to address some of them. The most important misconceptions Maddox displays are that of first cause, of classical intuition, and of distrust of the abstract.

(Those who want to read this post in blog form can do so here:
http://www.thephysicsmill.com/2015/11/12/bruno-maddox-and-the-magnet-a-story-of-misconceptions/)

(DISCLAIMER: The opinions in this article are my own. I will be describing very little real science here… just philosophy.)

The Misconception of First Cause

Early in his article, claims that nobody can explain how a magnet works and that nobody seems to be particularly bothered by this.

For one thing, as far as I can tell, nobody knows how a magnet can move a piece of metal without touching it.

Maddox writes

And for another—more astonishing still, perhaps—nobody seems to care.

I want to talk about the notion of “touch” later. But for now let’s focus on the other part of that quote—that nobody seems to care. What Maddox is getting at, I think, is that science can never answer why something happens… at a fundamental level, it can only offer descriptions and make predictions. It can only tell you how something happens.

A Hypothetical Conversation

Let’s imagine, for a moment, a hypothetical conversation between Maddox and a physicist. If he asks about magnets… the physicist will say something like “oh the electromagnetic force is caused by the magnetic field.”

“Okay, so what causes the magnetic field?” Maddox might ask. And to this a physicist might say “Well, the magnetic field is really a relativistic echo of this more fundamental thing, the electromagnetic field tensor. A magnetic field is created by moving charge… but that motion depends on your point of view. The field tensor is invariant.”

Maddox might push further. “What causes that?” And a physicist might tell him that it’s a low-energy limit of the electroweak force.

Maddox, getting really aggravated now, might push again. “But what causes that?” And the physicist, depending on her leanings on quantum gravity, would give him an unworried shrug. “We don’t know. It just is.”

What’s Wrong With Maddox’s Question

Do you see the problem? It’s the same problem as in theology. If you ascribe cause to something, then you must ask what causes the cause. One (very theological) answer is that God is infinite and can get around these petty problems like cause and effect.

But science has a better answer: we don’t know! And moreover, we cannot know! At a fundamental level, science is based on observations of the world around us. We are limited by what those observations can tell us. These observations can tell us a lot. They can tell us what happens—to bars of iron can be made to pull at each other. They can tell us how it happens—the bars attract if they are oriented in a particular way, otherwise they repel. And, with a bit of cleverness, they can give us the tools to make predictions—an electric current will attract an iron bar.

But observations, at some level, will fail to explain something. And that’s perfectly okay. In fact, it’s better than okay. It’s a good thing to know your limits! And this is a fundamental limit. The success of science is built on knowing that whatever Nature does must be the truth, no matter how counter-intuitive.

I believe Maddox knows this. He certainly lampshades it when he comments that

But as far as I can tell—and isn’t the point of science that all its bigger propositions come accompanied by this noble caveat?—[Steven Weinberg] really can’t [explain how magnets work].

But Maddox sees this as a reason to distrust science and it is not. It is science’s greatest strength.

(I don’t mean to imply that science has no explanatory power. It tells us that magnetism in a bar magnet is caused by either atomic spin or electron spin, for example… which is very powerful. But at some point, the chain of causes stops and you can go no further. We are empiricists and, at some point, we must simply accept things at face value.)

(I also don't mean to imply that we should stop trying to dig deeper. We must be always sceptical of what we know. But at the same time, we must be aware that we will fail to hit bedrock.)

The Misconception of Classical Intuition

Let’s reflect on that for a moment. Whatever Nature does must be truth, no matter how counter-intuitive. This is the second misconception Maddox displays. Maddox finds it unsettling that we cannot explain “how a magnet can move a piece of metal without touching it.”

But… what does it mean to touch? Let’s think about the subatomic realm, the world of quantum mechanics. In the world of atoms and electrons, “touch” is a fuzzy concept. For one thing, there is no such thing as a “particle.” Protons, electrons, neutrons, and even atoms and molecules, are not localized balls, like we’re used to in our world. They’re waves of probability, distributed throughout space (see: http://www.thephysicsmill.com/2012/12/30/the-dice-are-loaded-probability-waves/). What this means to us in the world of trains and aeroplanes is not totally clear. But it is the nature of Nature. So particles them, aren’t really particles.

For another thing, when we “touch” a table, there’s a lot of empty space between the atoms in our hands and the atoms in the table! What’s really happening is that the atoms in our hands are repelling the atoms in the table… for a variety of reasons, including the electromagnetic force and the Pauli exclusion principle (see: http://www.thephysicsmill.com/2013/01/27/binary-unity-the-pauli-exclusion-principle/). There’s none of the “touching” Maddox seeks at all! Maddox is disturbed by the idea that we appeal to “spooky action at a distance,” but a more interesting question is are there any forces that aren’t, fundamentally, this sort of spooky action at a distance.

(As a historical note, Einstein described quantum mechanics as “spooky action at a distance” because he was disturbed by the fact that quantum entanglement seemed to violate causality. We know now that it does not violate causality and Einstein was worried for nothing. But the electromagnetic force never bothered Einstein.)

Maddox is falling prey to the fallacy of classical intuition. He believes that because he experiences the world in a particular way, the world must be that particular way. But Nature is not so gentle! We evolved to perceive the world in a way that benefits us evolutionarily… not in the way it really is! Again, the great strength of science as a methodology is that it overcomes this classical intuition and allows us to glimpse the world as it really is. (Or at least, closer to how it really is.)

A Fallacious Distrust of the Abstract

Finally, Maddox says that

When you get right down to it, the mystery of magnets interacting with each other at a distance has been explained in terms of virtual photons, incredibly small and unapologetically imaginary particles interacting with each other at a distance. As far as I can tell, these virtual particles are composed entirely of math and exist solely to fill otherwise embarrassing gaps in physics, such as the attraction and repulsion between magnets.

Well, Maddox is right about one thing. Virtual particles are unapologetically imaginary. This is a complaint that I, and many other scientists, share with Maddox. But this isn’t a problem with the science. It’s a problem with lazy science communication.

As I described above, the notion of a particle is deeply misguiding. A particle is a “human-scale” approximation of the true nature of reality, which is made up fields and waves. Really, force isn’t carried by virtual particles. It’s carried by fields, which interact with each other via waves that travel at speeds no greater than the speed of light. And it just so happens that these waves look like particles to us if we squint. But this doesn’t work all the time. Sometimes the notion of a single particle simply doesn’t make sense (see: http://www.thephysicsmill.com/2015/01/25/sometimes-particle-isnt-possible/).

But, even in the realm of subatomic physics, the idea of a particle is very powerful. It provides intuition and a surprisingly robust computational tool. This is why, historically, high-energy physics has been misleadingly called “particle physics.” (And for those in the know, how the terrible name “second quantization” came to be.) And the notion of a virtual particle, an imaginary particle associated with the excitation of a quantum field, even more powerful.

So… if it makes good predictions…. is a virtual particle really imaginary? Or is it a valid way of interpreting the fundamental nature of reality?

The answer is that, despite my distaste for virtual particles… they’re often exactly as good of a description as waves—better, because they’re easy to work with. It’s true that the description fails sometimes, but so what?

(For experts, I’m discussing the occupation-number formalism of quantum field theory, vs. other formalisms. In particular, the occupation number formalism fails when a vacuum cannot be uniquely defined… a la Unruh effect or curved spacetime.)

This is why Maddox is wrong to distrust virtual particles. Maddox’s distrust seems to stem from the fact that virtual particles are purely mathematical and that there is a more general way to describe quantum fields. But he should not distrust this mathematical abstraction. It is the tool we use to make predictions.

Moreover, it’s the only tool we have. Scientists are not explaining why phenomena occur. Really what scientists do is build Lego models of the universe, simulacra that behave like the universe and allow us to make predictions. Equations and mathematical abstraction are the Lego blocks of our models. And the particle picture of quantum field theory is a very good model indeed.

Other Rebuttals

Maddox’s post is quite old… seven years old by now. I am not the first scientist to refute him. In particular, I’d like to recommend this blog post by Sabine Hossenfelder , which is, as usual, excellent:
http://backreaction.blogspot.ca/2008/04/spooky-action.html

Fighting fire with... jetpacks !

Jetpacks are about to get real. I kid thee not.

"Now, Dubai has announced an initial order for up to 20 Martin jetpacks, plus simulators and a training package, for delivery next year. But these will not be used as the latest must-have for the wealthy and foolish. Dubai wants them for more serious reasons. Lt Col Ali Hassan Almutawa, director of the Dubai Civil Defence Operations Department, said the packs would be used for reconnaissance and rescue. "We see them performing a first-responder role," he says, adding that the jetpacks would be particularly useful in the fire department during emergencies in Dubai's skyscrapers."
http://www.bbc.com/news/business-34778835

The EU is good for science

"Smith, an international relations theorist, said “all the evidence in the world” shows that “the best research is done by people working internationally”. He added: “The most successful knowledge economy is where people publish together with people in other countries. EU membership makes that immeasurably easier.”"

Originally shared by Jenny Winder
http://www.theguardian.com/politics/2015/nov/11/leaving-eu-would-be-a-disaster-british-universities-warn