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Violin fitting

Some classical violinists can play without a shoulder rest or even a chin rest. I was trained to grip the violin between my chin and neck firmly enough to hold it in a proper position without any support from my left hand. Given my long neck this was impossible to do without a shoulder rest, and even with a standard shoulder rest it was always a struggle. So when I resumed violin a few years ago I bought the Bonmusica shoulder rest, shown in the photos below, which was a great improvement. However, even with that adjusted to its maximum height I was contorting my neck uncomfortably to hold the violin in the proper position. Further research led me to an adjustable center-mounted chin rest by Wittner Augsburg. Installing that at its maximum height finally let me hold the violin with my chin in a relatively neutral position. Here are photos before and after that chin rest upgrade:

Playing violin takes a toll. Hearing damage in the left ear is one well known effect I enjoy. I suspect that my posture also cost me a left molar (since replaced with an implant) because I habitually clenched it between my upper jaw and left shoulder to hold the violin.

How much CO2 does a gas stove add to indoor air?

CO₂ meter next to gas stove boiling water
CO₂ meter next to gas stove boiling water

For fun I got a carbon dioxide (CO₂) meter. Standard atmosphere contains 400ppm of CO₂. Some studies suggest that mental performance begins to degrade when CO₂ concentration exceeds 1000ppm. I was surprised to see that when cooking on my gas stove (in the kitchen) the CO₂ meter in my office began to register levels approaching 2000ppm. I was curious to calculate how much CO₂ a simple gas burner adds to indoor air.

TL;DR: Using a gas stove to boil a gallon of water in an airtight 30m³ room adds about 2200ppm of CO to the air.

Detailed calculations

It takes about 1,300kJ of energy to heat a gallon of water from room temperature (20°C) to just boiling (100°C). (Specific heat of water is 4.2 J/g/°C, a gallon of water weights 3.8kg, so we have 3.8kg × 80°C × 4.2kJ/kg°C = 1,300kJ. Note that this does not actually boil the water because it takes another 2.3 J/g to vaporize liquid water at 100°C.)

A gas stove is around 50% efficient in transferring heat to water in a pot, so we need to burn enough gas to produce 2,600kJ. Natural gas is mostly methane (CH₄), and 1 mole of methane releases 900kJ when burned with oxygen, so we’re looking at burning 3 moles of methane. The combustion reaction is CH₄ + 2 O₂ → CO₂ + 2 H₂O, so we get one mole of CO₂ per mole of methane burned.

At standard temperature and pressure 1 mole of gas occupies 22 liters. If the kitchen is 30 cubic meters = 30,000L then it contains 1,363mol of gas. Adding 3mol of CO₂ would roughly be adding 3/1,366 = 2200ppm CO₂ to the room. So it’s easy to see how cooking with gas can markedly raise CO₂ levels throughout a house!

(Notes: For comparison, an average human at rest exhales about 11 moles of CO₂/day. Also, as noted in my previous post, a properly ventilated house exchanges air every 4 hours.)

I lost weight using two simple tricks (and you can too)

I lost 15 pounds in six weeks. I went from 190 pounds to 175, and have stayed at 175 for two months. All I changed is what I ate and how much.

The first trick is what to avoid eating: Avoid simple carbohydrates, and absolutely no sugary food! Before this experiment I had a very carb-heavy diet (i.e., one built around cereals, rice, pasta, potatoes), and I never abstained from desserts. In my experience, eating simple carbohydrates – especially sugars – leads to blood-sugar crashes that make me extremely hungry after a few hours. When I cut out sugar I never experience hunger like that. So I stick to vegetables and protein. (My go-to snack now is a Pure Protein bar.)

The second trick is to eat less. Before this experiment I didn’t have any portion control: I would whatever was served, and at a shared meal I would volunteer to finish anything that was left. Now the question became how little can I eat? I could eat two hamburgers, but I can also eat just one. Where before I would pour a full bowl of cereal, now I pour half a bowl. Less also means avoiding extra fats when possible. So no adding butter or mayonnaise to things. No fatty/starchy snack foods. Nothing deep-fried.

Eating less actually reduced my stomach capacity. I get full on less food, and I can’t eat as much in a sitting as I used to.

Neither of these tricks completely eliminates hunger or cravings, but not being fully satisfied at all times is part of life. The only thing I allow myself to eat outside of mealtimes are protein bars, carrots, or diet soda. That’s it. A simple rule, so there’s no thinking, no bargaining, no calorie counting. And no way to not lose weight!

(NB: Some cravings might be driven by nutritional deficits, so I take a daily multi-vitamin. As long as I have body fat I don’t have a calorie deficit.)

AI Image Generators

I just got beta access to DALL-E, OpenAI’s large-language-model-based diffusion image generator. It’s a very interesting tool to play with.

Thomas loves cats and is showing exceptional aptitude at fencing, so I asked DALL-E for a “Vermeer style portrait of a dignified cat posing as an olympic fencer wearing a white vest and holding his saber in one arm and mask in the other.” Here are some of the results:

My war against advertising algorithms

I went to Costco.com to check the price of a vacuum my mom wanted. Now I’m getting ads for it.

I couldn’t figure out how to get a trial of Adobe Creative Cloud off my computer. My search for their hidden uninstall tool now has me getting ads for Adobe services even though I despise them and was only searching how to get rid of them.

Do I click on the ad to make Adobe pay? Or do I not click, even on things that interest me, because I don’t want the algo to win?

How much water is in the air?

My skin and sinuses don’t like dry air, and nothing dries air like heating it: Heat freezing air at 40% relative humidity (RH) to room temperature and the relative humidity drops below 10%, which is as dry as deserts at noon!

So when indoor heat comes on in the winter I break out the humidifiers. If my living space has a central air handler I install an automatic humidifier on that. If not I have to manually fill portable humidifiers. Which led me to wonder: How much water does it take to bring the humidity in dry air back up to comfortable levels?

It turns out that the moisture capacity of air is very non-linear with temperature: For example, air at 100°F holds 10 times as much water as freezing air!

Thanks to data here we can see that air at room temperature (20°C/68°F) holds up to 17g of water per cubic meter. So a 1000ft2 living space with 9-foot ceilings can hold just over 4kg, or 1 gallon of water, at 100%RH.

Humidity in living spaces should be kept below 50%RH because mold really thrives above that level. So when outdoor air is below freezing we need to add half a gallon of water to the heated indoor air of my hypothetical 1000ft2 living space. But healthy living spaces also exchange fresh air – ASHRAE recommends eight air changes per day – so if that living space is properly ventilated then we will have to add four gallons of water per day!

The Immortality Key

The Immortality Key is an important book. I had only read the Forward and half of the Introduction when I was convinced of the book’s essential thesis:

  • The human psyche has an innate capacity for a common experience of “transcendence,” which in our cultural terms might be called “seeing or knowing God.” Transcendence can be found across cultures and time in religious archetypes and practices. But most humans can only obtain the real transcendental experience with the aid of entheogenic (a.k.a. psychedelic) chemicals.
  • Humans going back to prehistoric times have made ritualistic use of natural entheogens. Many have emphasized that the transcendence found through these chemically-enhanced rituals is critical to the well-being not only of individuals but also of human society.
  • It appears that a single powerful entheogenic experience is sufficient to convert a person for life. (For example, Greeks who underwent the entheogenic ritual at Eleusis were given the title epoptēs, or “witness.” And ongoing research with entheogens has found that a single dose of psilocybin can relieve major depression.)
  • Spiritual use of entheogens has perhaps been stigmatized by abuse in the 1960s and 1970s. The hippie movement profaned the use of entheogens that were, and probably should be, sacred.
  • Modern organized religions and governments have nefariously eliminated access to entheogens. For example, it is astonishing that chemicals like psilocybin and LSD have been banned under DEA Schedule 1, which is reserved for substances “that have a high chance of being abused or causing addiction, and no FDA-approved medical use,” whereas scientific research has always found them to be non-addictive, with low potential for abuse.

How do you “see God?” As with all human traits, there is a spectrum of capacity. Some people are gifted (or afflicted) with transcendental vision – most likely many of those called prophets. For many more people, transcendent vision can be obtained through devoted fasting, prayer, scourging, or meditation. But it appears that anyone can transcend with the use of entheogenic chemicals. The Immortality Key impresses the notion that Christianity is (in my words) a relatively dead religion: Christian doctrine correctly describes transcendence, but Christian rituals are hollow versions of those that humans have relied on for tens of thousands of years to actually experience transcendence. Yes, these hollow rituals are sufficient for some. For others, like me, they at best offer one fleeting glimpses of transcendence.

The Immortality Key has its shortcomings. After the first few chapters the author bogs down flogging the Pagan Continuity Hypothesis and exulting over his discovery of small scraps of evidence he found in a decade of research. Jerry Brown wrote a good review that should be read to put the book in its proper place.

The book does expound upon a few other worthwhile points. The author is an academic classicist, and along the way he (like all classicists) impresses on the reader how little our culture has evolved from that developed by the Greeks in the first millennium BC. Then he details the shocking efforts by early Christians to try to erase that culture. They nearly did, most unconscionably by burning the library at Alexandria. Today we have only 1% of classical texts known to have existed.

The last chapter is an interesting read: It shows how the concept of “witches” was developed by the middle Catholic Church and used to destroy whatever western folk knowledge of entheogens may have otherwise survived. Then, Christian missionaries in the Americas largely succeeded (often through the force of government) to suppress entheogenic use among indigenous Americans. Hopefully we are now at the end of the war on entheogens and the revival of mainstream acceptance of and access to transcendental experience.

Why We Make Things

I recently listened to Peter Korn’s book Why We Make Things and Why It Matters: The Education of a Craftsman. (Like most books, the substance is concentrated in the beginning; and roughly a third of the way in the book becomes relatively unimportant; and the last third often seems like filler to make it long enough to bind and sell as a traditional book.) It is a good exploration of man’s search for meaning, and how man finds meaning in craftsmanship. And I think this is a particularly male struggle: The female psyche finds meaning in the people around her, and particularly in that most powerful and consummate of bonds: between a mother and her children. But the maturing male psyche detaches, leaving him adrift in abject existential loneliness. To become a man he has to discover or build his purpose. He may find meaning in social spheres, but he can also find meaning in the creation or nurturing of things – i.e., he can find meaning as a craftsman.

Korn beautifully describes the nature of craftsmanship – how an artisan develops intuition and connection with materials and processes; the state of “flow” a master can attain practicing his art. And Korn repeats lamentations about how the industrial revolution turned craftsmen into automata, destroying the opportunity for so many working men to find essential meaning in their labor.