Category: Geek stuff

If it involves physics, math, computer science, electronics or has general geek cachet, this is the place for it.

Meltdown

I watched the four-part Netflix series on the Three Mile Island disaster and found it to be well crafted and emotionally poignant, though only OK as an educational resource on the partial meltdown.

My technical complaint is that they explain almost nothing about why the accident happened and exactly what took place while it was going on. There is a lot of interesting material on how complex systems have interactions which cannot be foreseen, as well as user interface issues in the control room, which would have helped viewers better understand.

In terms of storytelling, my objection is with how the filmmakers basically set up two kinds of interview subjects: forthright and emotional local residents who suffered, and a few wicked representatives of the industry. They quote dismissive claims about culpability and the accident’s severity from the insiders, while uncritically quoting residents on how an unchecked disaster would have destroyed Pensyllvania or the East Coast. To me this all felt like too much handholding about who to believe, coupled with insufficient reference to credible outside accounts.

I wouldn’t especially recommend the series to either people who know a lot about nuclear energy or those who know fairly little. The former are likely to be annoyed at how anecdote-driven the whole thing is, while the latter may be given a false sense of confidence about the correctness of the view expressed. Unlike the remarkable 2019 series on the Chernobyl accident, this is one that can be safely missed.

For better explanations on TMI, I would suggest Nickolas Means’s talk (which also contains some fascinating discussion about what human error means in the context of major industrial accidents and how to investigate them after the fact) or this Inviting Disaster episode from The History Channel.

Social media and the solitudes of left and right

I have seen a lot of discussion about Jonathan Haidt’s recent article in The Atlantic about how social media has broken US politics. It contains some important criticisms of the progressive left, as well as the authoritarian right — particularly about their demand that all speech and thought should conform to their ideological agenda.

On all sides there is a withdrawal from pluralism, the belief and practice that a diversity of political opinions is normal and desirable:

The former CIA analyst Martin Gurri predicted these fracturing effects in his 2014 book, The Revolt of the Public. Gurri’s analysis focused on the authority-subverting effects of information’s exponential growth, beginning with the internet in the 1990s. Writing nearly a decade ago, Gurri could already see the power of social media as a universal solvent, breaking down bonds and weakening institutions everywhere it reached. He noted that distributed networks “can protest and overthrow, but never govern.” He described the nihilism of the many protest movements of 2011 that organized mostly online and that, like Occupy Wall Street, demanded the destruction of existing institutions without offering an alternative vision of the future or an organization that could bring it about.

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The “Hidden Tribes” study, by the pro-democracy group More in Common, surveyed 8,000 Americans in 2017 and 2018 and identified seven groups that shared beliefs and behaviors. The one furthest to the right, known as the “devoted conservatives,” comprised 6 percent of the U.S. population. The group furthest to the left, the “progressive activists,” comprised 8 percent of the population. The progressive activists were by far the most prolific group on social media: 70 percent had shared political content over the previous year. The devoted conservatives followed, at 56 percent.

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The most reliable cure for confirmation bias is interaction with people who don’t share your beliefs. They confront you with counterevidence and counterargument. John Stuart Mill said, “He who knows only his own side of the case, knows little of that,” and he urged us to seek out conflicting views “from persons who actually believe them.” People who think differently and are willing to speak up if they disagree with you make you smarter, almost as if they are extensions of your own brain.

…

The “Hidden Tribes” study tells us that the “devoted conservatives” score highest on beliefs related to authoritarianism. They share a narrative in which America is eternally under threat from enemies outside and subversives within; they see life as a battle between patriots and traitors. According to the political scientist Karen Stenner, whose work the “Hidden Tribes” study drew upon, they are psychologically different from the larger group of “traditional conservatives” (19 percent of the population), who emphasize order, decorum, and slow rather than radical change.

As the world gets more destabilized, there is a trend of us all getting pushed into deeper solitudes, unable to even perceive how our own views and presuppositions relate to those of our fellow citizens. The article makes some suggestions for mechanisms to counter that, but it’s hard to imagine them (if they could even be implemented) counteracting the forces pushing us toward a politics of outrage.

Fry on the brain and memory

It may not be easily accessible to non-Audible subscribes, but Stephen Fry’s 12-part series “Inside Your Mind” is thought-provoking, informative, and excellent. He does a great job as a science popularizer and communicator, sharing experimental research without jargon and in a consistently accessible and engaging way.

So far, I have found the episode on memory to be especially intriguing, with the idea that memories aren’t records stored in static form like journal entries but rather ephemeral in-the-moment creations arising from the work of many parts of the brain, and neurologically very similar to imagining a future situation.

Fry associates the idea with Charles Fernyhough’s “Pieces of Light: How the New Science of Memory Illuminates the Stories We Tell About Our Pasts”, which I have added to my non-dissertation reading list.

The JWST is in orbit

In what may be the rocket-launched science story of the decade, the James Webb Space Telescope launched from the Guiana Space Centre in Kourou, French Guiana early Christmas morning Toronto time with me and many other science nerds watching the feed with mingled excitement and fear.

The process from here is remarkable both in terms of orbital trajectory and spacecraft deployment. This Scott Manley video shows the unusual position in space the JWST will occupy and the engineering and science reasons for it. This animation shows the planned deployment sequence for the spacecraft, which had to be folded to be housed in an aerodynamic fairing to push up through the Earth’s atmosphere.

Pandemic walk heat maps

As part of playing around with my GPS data from my exercise walks since I wanted to make a heat map showing the likelihood of being in any particular place.

Here’s one I made using Seth Golub’s heatmap.py Python script (radius 5, decay 0.75):

I also made one in QGIS. First I converted the tracks to a set of points in a CSV file. Then I created a spatial index of the point layer, created a hexagonal grid of polygons of a sensible size, and counted the number of points in each. Then I rendered that as brighter or darker hexagons:

Here are the hexagons semi-transparent and rendered on a faux watercolour of the Toronto area:

The walks have sometimes been lonely and sometimes been scary, but they have been the main thing getting me out of the house and providing exercise during the pandemic. They do make me feel like I have a broader understanding of the city, though walking through a neighbourhood at night with headphones on only gives you a certain kind of perception.

3D printing in metal and at large scale

Producing items additively by combining small pieces instead of starting with unshaped materials and cutting into them offers many intriguing possibilities, most notably the ability to make structures which would be implausible or impossible to make via conventional techniques and the option to customize every item produced to the dimensions and other specifications chosen.

This video from the architecture and furniture design group MX3D gives a sense of what is becoming possible:

See also: Feast Your Eyes Upon the World’s First 3D-Printed Steel Bridge

Networked citizen science ecology

Promoted by a recent Economist article on biodiversity and Alie Ward’s podcast on foresting ecology, I am trying out the iNaturalist app.

My outdoor pursuits mostly consist of walking at a steady pace for exercise, so plant and wildlife observations aren’t my priority. Nonetheless, it’s neat to be able to take a break anywhere in the city and use the map in the app to see what people have documented in the neighbourhood.