PI accepting 2017 master’s student applications

The Perimeter Scholars International (PSI) program is now accepting applications for this Master’s program, to start next fall. The due date is Feb 1st. Me previously:

If you’re in your last year as an undergrad, I strongly advise you (seriously) to consider applying. Your choice of grad school is 80% of the selection power determining your thesis topic, and that topic places very strong constraints on your entire academic career. The more your choice is informed by actual physics knowledge (rather than the apparent impressiveness of professors and institutions), the better. An additional year at a new institution taking classes with new teachers can really help.


Here’s the poster and a brand new propaganda video:
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Comments on Hanson’s The Age of Em

One of the main sources of hubris among physicists is that we think we can communicate essential ideas faster and more exactly than many others.This isn’t just a choice of compact terminology or ability to recall shared knowledge. It also has to do with a responsive throttling of the level of detail to match the listener’s ability to follow, and quick questions which allow the listener to hone in on things they don’t understand. This leads to a sense of frustration when talking to others who use different methods. Of course this sensation isn’t overwhelming evidence that our methods actually are better and function as described above, just that they are different. But come on. a   Robin Hanson‘s Age of Em is an incredible written example of efficient transfer of (admittedly speculative) insights. I highly recommend it.

In places where I am trained to expect writers to insert fluff and repeat themselves — without actually clarifying — Hanson states his case concisely once, then plows through to new topics. There are several times where I think he leaps without sufficient justifications (at least given my level of background knowledge), but there is a stunning lack of fluff. The ideas are jammed in edgewise.… [continue reading]

Inaccessible Wikipedia science articles as inclusionism

I thought this criticism by Ars Technica of the woeful state of Wikipedia’s science articles was mostly off the mark. (HN Comments.) The author framed it as a conflict between laymen and specialists, claiming that scientific articles are targeted at specialists at the expense of laymen, with lots of jargon, etc. I eagerly agree with him that there are lots of terrible science articles, and that some technical articles could use better context and introductory bits. But I think this is largely a problem of not having enough skilled science writers rather than a purposeful choice between laymen and specialists. Due to the curse of knowledge the specialists literally do not understand what is and isn’t accessible to laymen; they see through the jargon like the matrix. And the laymen do not get in their gut how many true technical dependencies there really are, that unless you understand topics X and Y, topic Z is pretty much useless. They assume that all this jargon is used by the specialists either because they are too lazy to translate, or are purposefully constructing barriers to entry. I empathize with skilled science writers (which are unfortunately rare), because their best articles often go unnoticed as both laymen and scientists read them and shrug “Yea, that’s pretty clear.… [continue reading]

Robert Zubrin’s reasoning on space exploration

[Just shooting from the hip here, for fun.]

I think we should send humans to Mars, but I don’t really think it’s possible to justify it as an instrumental means of achieving other more concrete goals. (I just take it as an intrinsic goal.) But here is Robert Zubrin making the best instrumental case I’ve heard.

My biggest criticism is that not finding evidence of life on Mars does not imply life is extraordinarily rare, because there are other options besides easy-starting life (with the great filter somewhere after) and extremely-hard-starting life. If you think it’s possible that there’s a filter strong enough to prevent single-cell life from developing interstellar travelI’m skeptical. When it comes to estimating extremely unlikely events, with multiple independent unlikely steps that all need to happen quickly, the development of the first replicator seems to require vastly more steps than relatively simple things like sexual reproduction. The only thing that makes me uncertain is the possibility that there are extremely simple replicators that resemble nothing like minimal cells, and there is a relatively natural progression to minimal cells that simply isn’t large enough to leave fossils. I would love to update on this if you know something I’m not thinking of.[continue reading]

New Horizons Pluto flyby

If you’re a fellow nerd, you know that New Horizons is bearing down on Pluto. It had a scary hiccup a few days ago but recovered quickly. Closest approach occurs on Tuesday.

The data connection from Pluto is very slow (~1kbit/s, I believe). Furthermore, the one-way latency is over 4 hours, and the spacecraft can’t transmit to Earth at the same time it is photographing. So to a good approximation, the encounter will take place over just a day or two of near radio silence, followed by several months of images and other data slowly dripped back. (New Horizons can’t see much once it’s gone past Pluto since everything will be dark, other than a few measurement of the atmosphere by looking at sunlight passing through it.) For excellent details and links about what you can expect to see when, look here and here. For a nice Wikipedia-level PDF, see here, and for an infinite rabbit hole of message board links, see here.

Added: New image, still well below the max resolution we will eventually see.

Added: New Horizons survived the encounter.… [continue reading]

Hanson-ism: Travel isn’t about intellectual exposure

I often hear very smart and impressive people say that others (especially Americans) who don’t travel much have too narrow a view of the world. They haven’t been exposed to different perspectives because they haven’t traveled much. They focus on small difference of opinion within their own sphere while remaining ignorant of larger differences abroad.

Now, I think that there is a grain of truth to this, maybe even with the direction of causality pointing in the correct way. And I think it’s plausible that it really does affect Americans more than folks of similar means in Europe.Of course, here I would say the root cause is mostly economic rather than cultural; America’s size gives it a greater degree of self sufficiency in a way that means its citizens have fewer reasons to travel. This is similar to the fact that its much less profitable for the average American to become fluent in a second language than for a typical European (even a British). I think it’s obvious that if you could magically break up the American states into 15 separate nations, each with a different language, you’d get a complete reversal of these effects almost immediately. a   But it’s vastly overstated because of the status boost to people saying it.… [continue reading]

Discriminating smartness

It seems to me that I can accurately determine which of two people is smarter by just listening to them talk if at least one person is less smart than I am, but that this is very difficult or impossible if both people are much smarter than me. When both people are smarter than me, I fall back on crude heuristics for inferring intelligence. I look for which person seems more confident, answers more quickly, and corrects the other person more often. This, of course, is a very flawed method because I can be fooled into thinking that people who project unjustified confidence are smarter than timid but brilliant people.

In the intermediate case, when I am only slightly dumber than at least one party, the problem is reduced. I am better able to detect over-confidence, often because I can understand what’s going on when the timid smart person catches the over-confident person making mistakes (even if I couldn’t have caught them myself).

(To an extent, this may all be true when you replace “smarter” with “more skilled in domain X”.)

This suggests that candidate voting systems (whether for governments or otherwise) should have more “levels”. If we all want to elect the best person, where “bestness” is hard to identify by most of us mediocre participants, we would do better by identifying which of our neighbors are smarter than us, and then electing them to make decisions for us (possibly continuing into a hierarchy of committees).… [continue reading]