The rambling, introspective, and at times (I felt) dramatic nature of my most recent post has brought something back to the forefront of my mind. While writing for such a disparate audience: family, friends-from-home, friends-from-school, students-from-HSYLC, future-people-I-haven't-met-yet, etc., I want to be aware of the inferential distances I'm asking my readers to jump across.

That is to say, there are mental shortcuts (e.g. "reference class" or "model (of an actor)") and cached thoughts (e.g. "humans are bad at multiplying" or "I should love 7*10^9 people an unimaginable amount more than 1") that seem obvious to me but may not be so accessible nor apparent to my readers. To be completely honest, I suspect that, for most people, "Looking Backwards", "Errata, Food, Reductionism", and "Greetings, Polyphasic Sleep, and Chives" had large sections which were more-or-less opaque with jargon or (seemingly) blind assertions.

But most of what I write seems rather intuitive to me. Which is, of course, because basically everything I write is at most one inferential step away from anything else inside my head. Not so for the rest of my readers. I'm writing from a particular accumulated background: informational (e.g. the many authors -- academic or otherwise -- I've read over my lifetime), cultural (e.g. the parlance, logical abstractions, and norms I've become accustomed to using when talking with my close friends at Harvard or acquaintances in the Effective Altruism or LessWrong communities), and personal (logical leaps that make perfect sense to me, but are difficult to explain to others).

Together, these lead me to something like a a

Challenges in writing about events from the perspective of afterward: Getting things down while they're still fresh in the mind. And so, I figure I'll start with that which is most fresh: returning home.

On the morning of the 23rd, I woke up early enough to see my friends off on their trip to see the Great Wall. I never did get to see it, or the Forbidden City, or the Summer Palace, or the 798 District, or anything else of real cultural interest in Beijing. But that's probably alright; I'll be in China again in the not-so-distant future. It's not like I'm going to see (most of) any of these kids any other time in my life. And so I don't feel so bad about missing a few sightseeing opportunities if it means I got to spend more time with a crop of truly fantastic students.

People ask me "How was China?" or "What did you see?", and my answer to either is "I didn't see much of the country; I only really saw three hundred gifted schoolchildren." Then they say "Oh." and I hastily clarify "But the kids were great, really fantastic." They don't get it, but I really do mean it; they were worth all of the opportunity cost.

My grandfather is fond of saying: "Most things, they can take away. But they can't take away what's in your stomach, or in your head." Which is to say, of course, that when the North Koreans came back to take away your money, they couldn't so easily rob you of what you had invested in your

The engine room for internet is under construction without power and cann't be used until 18August. Sorry for inconvenience.

...and oops, there went my blogging plans. Once the engine room was back up and running, it turned out that the uptime was too slow for my Harvard VPN to connect more than half the time, and of course, once the 14-hour workdays began, I didn't have the time, energy, or werewithal to sit down and blog. Besides, there were too many wonderful people around me to spend my time-units away from them.

I tried my best to keep a running journal of things that struck me as good things to post about, so I hope to reconstruct many-to-most of the posts-I-would-have-written over the next week or so. Perhaps it's not as genuine, but I'll try my best to write while it's still fresh in my mind. I figure I owe you guys at least that much for the head-fake I gave you before leaving for far-away places.

For the next ten days, I'll be in Beijing, China (specifically "The High School Affiliated to Renmin University of China", I kid you not...) as a part of HSYLC, the (Harvard Association for US-China Relations) Summit for Young Leaders in China. Yeah, it's a mouthful.

More specifically, I'm here to teach math. I'll be teaching 3day*1.5hour seminars to four groups of 10-15 gifted students from high schools around China. In addition to that, I'll hold office hours, run a workshop on applying to college in the US, and lead extracurricular activities. (Mine will very likely be something dance-related.)

If you're curious about my actual curriculum, then rest assured that I'll write about it...later. Today's post is just a series of travel-journal snapshots from the past day-and-a-half-long day. Tomorrow, we begin checking in students, and on Thursday, we'll actually start classes. Until then, I'm adapting to life in a country where I literally can't communicate with most of the population... (On the bright side, they have air conditioning here, which couldn't be said of Cambridge.)

11-12 August

(1) JFK Airport

I walk up to the cash exchange. "Three hundred Chinese." The teller is bored half to death. "Three hundred dollar to Chinese?" "No, three hundred renminbi." I slide a credit card through the cash slit. "Cash only." Of course. "How much?" Sixty-six. Which is a problem, because I think I only have...sixty-nine. Okay.

There's still time to kill. Shopping list: power adapter, money belt, pepto-bismol. The store clerk tries to give me an all-in-one power adapter; I return it to the shelf in favor of

For those of you following along at home, I've re-named this here weblog. I wrote the first few posts under "Turtles and Turtles", which might be a fine title, were I writing about physics. ("Turtles all the way down" is a common metaphor for infinitely recursive layers of increasingly precise physical theories, each model of the universe underlain by a "deeper" physical law.) But I'm not a physicist (nor writing about physics). Depending on the day, my mood, and the transit of Venus, I may be a mathematician, computer scientist, or aspiring rationalist, but in any case, physics is a hobby, not my art.

The new title, "My Faults My Own" is firstly a (not-so-humble) litany for humility, and secondly a nod to the great popularizer of mathematics Vi Hart (autoplay warning: youtube channel). Her brilliant piece, Doodling in Math Class: Connecting Dots (a lament of the state of twenty-first century mathematical education, masquerading as a lesson in curiosity-driven mathematical exploration, masquerading as a lesson on constructive geometry in the cartesian plane, masquerading as the ramblings of a student bored by an uninspiring high-school math class) concludes with a rallying cry for rationalists, explorers, and doodlers alike:

Here's the thing about connecting dots. You can have all the steps laid out for you, taking whatever next step is easiest and closest and be sure of what you're getting the whole time. This way is safe and comfortable.

Or, you can try new ways of connecting dots and not know what you're going to get. Maybe it will be something great, maybe it will fail. And when it fails it will be your

(The title of this blog post brought to you by "potential romantic comedy plots in five words or less")

(1)

A few months ago, Harvard's George Vasmer Leverett Professor of Mathematics recommended a movie to his freshman Real Analysis class -- on some tangent in class, he noted that "it's a fantastic movie; you should all watch it."

The movie was Spring Breakers. So, the other day, a few friends and I borrowed the Jefferson 250 lecture hall (where we had once-upon-a-time taken RA with GVL Prof. Gross) and threw the movie up on the giant projector screen.

We turned it off after thirty minutes of nauseating dialogue, uncomfortable soft-core pornography, and implausible montages of "college kids" drinking "beer". It was bad. Really bad. I'm really not sure how Prof. Gross managed to sit through the movie himself.

But really, the problem here is that I still don't know why we were told to watch this vapid, gratuitous, teen-star nonsense. What I've considered so far:

• Benedict Gross has never seen more of the film than the opening party scene and the stuck-in-history-class scene, and made a suggestion off-the-cuff. As I recall, he went so far as to reference the latter in the discussion of the fact that no one was going to pay attention to Real Analysis the day before spring recess, anyway.
• The man wished for his students to associate excessive drinking with stupidity. It's true that, speaking to his Linear Algebra class before The Game, he told us "I used to be Dean of Harvard College, so I know what weekend it is. But if I'm walking through the

(1)

It's become apparent to me in the past few days that, when I wrote last week's post on the theory of sleep, I didn't know what I was talking about. Or rather, I had an incomplete picture of the subject at hand, and oversimplified a system that was more complicated than I was giving it credit for.

A little more digging has revealed that there is, in fact, evidence that SWS may be important for consolidating declarative memory, which breaks down into episodic memory (events) and semantic memory (facts). By contrast, REM consolidates procedural memory and spatial memory (both of which are more or less exactly what they sound like). Previously, I had dismissed it as "useless". Oops.

Of course, that's not the whole story, either: non-REM sleep is split into periods of "light sleep" and periods of SWS. Altogether, an 8-hour monophasic sleep cycle includes something like 1-2 hours of REM, 1-2 hours of SWS, and 4-5 hours of NREM2 light-sleep. The goal of the E3 schedule, then, isn't so much to absolutely reduce needless SWS, but to restructure the sleep cycles to reduce NREM2, at minimal cost to SWS/REM. (Note that E3 differs from other polyphasic schedules in this respect; notably, Uberman almost entirely eliminates SWS, and packs two hours of REM into just six short naps.)

Now, it makes intuitive sense that, if the brain is using SWS for consolidating certain types of memory, there's an additional "rest state" where it's actually doing nothing but resting. And so,