Matters of moment

John Barrow, the Cambridge mathematician (and one of my fellow patrons of the Cambridge Science Festival) has a lovely paper in arXiv. It solves a problem that has always bedevilled competitive rowing — the fact that in an apparently perfectly-balanced coxless boat one still gets a ‘wiggle’ which reduces the efficiency of the team. The Abstract reads:

We consider the optimal positioning of an even number of crew members in a coxless racing boat in order to avoid the presence of a sideways wiggle as the boat is propelled forwards through the water. We show that the traditional (alternate port and starboard) rig of racing boats always possesses an oscillating non-zero transverse moment and associated wiggling motion. We show that the problem of finding the zero-moment rigs is related to a special case of the Subset Sum problem. We find the one (known) zero-moment rig for a racing Four and show there are four possible such rigs for a racing Eight, of which only two (the so called ‘Italian’ and ‘German’ rigs) appear to be already known. We also give the 29 zero-moment solutions for racing Twelves but refrain from explicitly listing the 263 Sixteens and 2724 Twenties which have zero transverse moments. We show that only balanced boats with crew numbers that are divisible by four can have the zero-moment property. We also discuss some aspects of unbalanced boats, in which the number of port and starboard oars are unequal.

Isn’t mathematics wonderful? When I was a graduate student, one of my mathematician friends spent three days figuring out the fluid dynamics behind the swirl patterns in his morning coffee. I’m reminded of G.H. Hardy’s lovely book, A Mathematician’s Apology and his famous observation that he had “never done anything ‘useful’. No discovery of mine has made, or is likely to make, directly or indirectly, for good or ill, the least difference to the amenity of the world.”

As you might expect, he was wrong; according to Wikipedia, some of his mathematical work found its way into ‘useful’ applications — e.g. in physics to find quantum partition functions of atomic nuclei (first used by Niels Bohr) and to derive thermodynamic functions of non-interacting Bose-Einstein systems.

Inside the mind of the Digger?

Unless you’ve been vacationing on Mars you will know that Rupert Murdoch has been threatening to ban Google from indexing News Corporation websites. This proposition seems so bizarre that it’s had people wondering whether the Digger might be losing his marbles. There are (as I’ve observed before) two schools of thought:

1. He is losing his marbles.

2. He knows something that the rest of us don’t. Support for this view comes from people’s respect for his track record of making bold, risky decisions which have paid off handsomely. On the other hand, his record isn’t entirely unblemished when it comes to Cyberspace. This will be his third foray into Cyberspace, and his first two were not exactly unqualified successes. And even his purchase of MySpace, once hailed as an act of genius, is beginning to look tarnished in the light of Facebook’s rise. So let’s not get carried away by delusions of the Digger’s omniscience.

Kara Swisher is the latest commentator to attempt to fathom the Digger’s mind. In this post, she offers no fewer than five possible interpretations. Here’s a summary:

1. Murdoch really means it.

the increasing money being made by Google, even as their revenue has suffered, has developed into a growing problem.

Which is simply this: There is a lot more money to be made in searching for content than in making content.

This realization has to shake content czars like Murdoch to the core, but it is indeed the situation they find themselves in.

Murdoch makes a fair point in that journalism costs money to make and it used to have a solid economic system under it until Google and others on the Web disaggregated it wholly.

Thus, online aggregators become “tapeworms,” as The Wall Street Journal Managing Editor Robert Thomson quipped.

2. Murdoch really means to create a lot of confusion, in order to shake down Google.

Well, it would not be the first time Murdoch and many others of his ilk have used public sharp elbows and saber-rattling to get what they want.

Except in this case, the algorithm experts over at Google know precisely–down to the tenth decimal–how much linking to News Corp. makes for them.

And it is not much, especially when looking at the vast sea of data Google serves up.

Its money-making is widely dissipated, from searches for vacation information to mapping to car-buying to health. While news-finding definitely is part of the mix, it is not at the center of the Borg.

3. Murdoch really means to create a lot of confusion, in order to shake down Microsoft.

4. A deal will be made.

My not-too-surprising prediction is that in the end, News Corp. and others will probably strike some kind of lesser deal with Microsoft – although it will tout the heck out of it – while taking some of its content behind a pay wall and thereby de-indexing it from Google.

5. The truth is out there.

In perhaps his most strident television interview, with his Sky News Australia service (which you can see below–oh, the irony–on Google’s YouTube), Murdoch said about those who use Google to find News Corp. content:

“They don’t suddenly become loyal readers of our content. We’d rather have fewer people coming to our Web site but paying.”

That really is the honest truth in all this hubbub: Murdoch and other publishers have to find a way to get a some pool of dedicated online readers to pay enough to be able to then provide them with content that will keep them coming back for more.

That’s a business that Google truly cannot help or hinder, really.

In a nutshell: something will happen but we don’t know what.

Can Twitter users link out?

Well, blow me down! No sooner do I publish a column about suspicions that Facebook was de-linking incoming tweets before converting them into status updates than I find this post by Dave Winer.

I have several accounts that I use for testing Twitter apps. One of them, bullmancuso, was shut down last October. A few weeks ago I petitioned to have the account restored.

This evening I got an email from the Twitter support person BFF, who explained:

“Your account was suspended because our specialists found that your tweets were primarily links to other sites and not personal updates, a violation of Twitter Rules.”

http://help.twitter.com/forums/26257/entries/18311

It’s true of that account but it’s also true of the NYTimes and many other news oriented Twitter sites.

I suggest they take another look at this.

And it’s a reminder once again that we’re playing in someone else’s ballpark here, and they make the rules. This is not in any way like the Internet.

Yep. Most of the people I follow on Twitter use the service in much the same way. A proportion of their tweets are, of course, ‘personal’ updates. But an awful lot of them are pointers to interesting stuff. For us, Twitter has become a kind of selective RSS feed — and that’s its main attraction. If Twitter declares that use illegal, then we’ll just move on.

Also, Dave is right to point out that this kind of behaviour runs directly counter to the spirit of the Internet — which is a technology that is entirely agnostic about the uses to which it is put. That’s a feature of the system, not a bug: it’s what was designed into the architecture of the network. It’s part of its DNA. If the guys who run Twitter want it to enjoy the same kind of organic growth as the Net and the Web had, then they had better learn the same kind of agnosticism. Otherwise they’re screwed.

There’s another interesting aspect to this also. At the Society of Editors Conference last weekend it was noticeable that almost every ‘innovative’ use of online media by existing newspaper groups is now either built around Twitter or assumes that the service will continue more or less as it is now. If anyone’s betting the ranch on that, then they should think again.

The links of O’Reilly

This morning’s Observer column.

LIKE MANY people in his business, the technology publisher Tim O’Reilly is a heavy user of the Twitter microblogging service. He also has a Facebook account. To save effort, he has arranged things so that his Twitter posts are automatically forwarded to Facebook where they are transformed into ‘status updates’.

So far, so good; many of us do the same. But O’Reilly is a proper techie, which means many of his tweets are links to web pages containing interesting or useful information he has come upon in his daily browsing. One day recently, a friend of his noticed that something strange was happening to those links: when they left Twitter they were clickable links, but when they arrived in Facebook they were just plain text. In other words, they were no longer clickable. To follow them one had to copy and paste them into a browser window.

This led to a brief outbreak of conspiracy theorising…

Quote of the day

“We are a frontier country and there are huge areas of rural America that still believe that the solution to everything is to get a bigger gun.”

Novelist John Irving, interviewed in today’s Irish Times.

The China syndrome

Reliable information on what’s going on in China is notoriously difficult to come by, but here’s a notable exception. On the roof of the US Embassy in Beijing there’s an air-quality monitoring station which continuously measures PM2.5 particle pollution (i.e the concentration of particles less than 2.5 micrometers in diameter in the air). These particles are so small they can be detected only with an electron microscope. The station sends out a tweet every hour with the data plus an assessment of overall air quality (AQI) and a one-word verbal summary, as for example here:

It’s been ranging between Unhealthy, Very Unhealthy and Hazardous all day. And since I’ve been following it, most days seem to be like that. So if you were thinking of a nice cosy, tax-free ex-pat posting to the Chinese capital, think again.

Twitter users can follow the service at www.twitter.com/BeijingAir

In praise of essays

One of the interesting side-effects of Twitter is that it liberates bloggers from one of their original duties — that of providing a set of links to interesting stuff elsewhere on the Web. That, after all, is where the genre originated — as weblogs which were just that, a list of links to other sites. In that sense, the first blogger was Tim Berners-Lee, the Web’s inventor, because one of the first pages he published on CERN’s server (info.cern.ch) was a daily-updated list of other web servers.

As the web grew, and pioneers like Dave Winer began to explore what could be done with this new publishing medium, a consensus emerged that a weblog should be more than just a set of links — that there should be at least some kind of annotation or comment accompanying the links. And so Blogging was born and rapidly morphed into a literary form which uneasily mixed link-logs with heavily hyperlinked prose pieces of varying length, profundity and authority.

I started blogging in the mid-1990s because I needed a way of creating a hyperlinked notebook to keep track of my online reading and to support my academic and journalistic work. I had discovered that if one spent any amount of time on the Web then simple, browser-based bookmarking rapidly became dysfunctional. I first used a tool called AOLPress which was free and lightweight (and which, I learned much later from TB-L’s memoir, had very respectable antecedents). For the first few years, my blog was effectively private — it was hosted on my own computers and not available on the Web. This made sense at the time because it really was more like a lab notebook than a literary product: it was a way of enabling me to escape the consequences of a poor memory, especially once I’d put a search engine onto it. I knew from then on that if I’d written about it on my blog then I would always be able to retrieve it later.

Memex went public towards the end of the 1990s after I’d started to use Dave Winer’s Userland software. But going public involved an uneasy compromise. The terseness of the private blog had to be softened, somehow, by some degree of elaboration, explanation or exposition. Otherwise, readers might have no idea of what lay behind a particular link or observation. So from the moment Memex went public it’s oscillated between weblog and blog, with a strong bias towards the former. Every so often, I would post extended pieces which were more or less polished (usually the latter), but for most of the time Memex has been mainly a rushed, idiosyncratic guide to things I have found interesting, instructive or significant. In that sense it sits at the opposite end of the spectrum from blogs whose posts are well-formed, carefully-crafted mini-essays: like, say, those written by the venerable Chicago firm of Becker & Posner, or by Paul Graham, Ed Felten, Clay Shirky, Diane Coyle, Martin Weller, Bill Thompson, or Sean French & Nicci Gerrard — to pick just a few names at random from my blogroll.

The great thing about social bookmarking services like del.icio.us and Twitter is that they could liberate bloggers from the weblogging side of their lives and allow them to concentrate on, well, online essays. Which of course raises the question of what is an ‘essay’. As chance would have it, this is a subject discussed by Zadie Smith in the introduction to her splendid new collection of the things, Changing My Mind: Occasional Essays.

As a noun, Smith observes, the word ‘essay’ has had “an unstable history, shape-shifting over the centuries in its little corner of the OED”.

For Samuel Johnson in 1755 it is: “A loose sally of the mind; an irregular undigested piece; not a regularly and orderly composition.” And if this looks to us like one of Johnson’s lexical eccentricities, we’re chastened to find Joseph Addison, of all people, in agreement (“The wildness of these compositions that go by the name of essays”) and behind them both three centuries of vaguely negative connotation. Beginning in the 1500s an essay is: the action or process of trying or testing; a sample, an example; a rehearsal; an attempt or endeavour; a trying to do something; a rough copy; a first draft. Not until the mid 19th century does it take on its familiar, neutral ring: “a composition more or less elaborate in style, though limited in range.”

Johnson’s definition seems to me to fit many of the longer posts one finds on the best blogs. They’re full of ideas, but not quite polished or honed: work in progress rather than finished products. As someone who has written a weekly mini-essay for (print) publication in a national magazine or newspaper for 50 weeks a year since 1982, I’m often struck by the differences between my Observer column and what I post here. In part, this is a response to the constraints laid upon one by a print publication; although my column is published (and widely read) online, its most important parameter — length — is set by the requirements of the page on which it sits in the print edition of the newspaper. So when I sit down to write a column, I know that whatever I have to say has to be fitted into 800 words.

Such a limitation makes no sense on the Web, where space is, in theory, infinite. But in fact the discipline imposed by the 800-word limit seems to me to be a beneficial thing. For one thing, it discourages prolixity and encourages brevity. As someone who agrees with Wittgenstein’s dictum that “if a thing can be said then it can be said simply clearly”* I rather like that.

An 800-word limit has other benefits too. It reminds one, for example, that readers’ time is precious and that one shouldn’t waste it. Space may be abundant on the Web, but attention is an increasingly scarce resource in this networked world. As Herbert Simon put it:

In an information-rich world, the wealth of information means a dearth of something else: a scarcity of whatever it is that information consumes, What information consumes is rather obvious: it consumes the attention of its recipients. Hence a wealth of information creates a poverty of attention and a need to allocate that attention efficiently among the overabundance of information sources that might consume it.

Simon wrote that in 1971, long before the Web was created and just when the Arpanet was getting into its stride, but it seems spot-on for today’s circumstances.

The other difference between writing for print and writing for one’s blog is that there comes a moment with the print essay when it has to be ‘finished’ and dispatched to the sub-editors: there’s an ‘end-point’, in other words. But, in a sense, a blog post is never ‘finished’; there’s always the possible of ongoing revision in the light of comments, or second thoughts, or sheer, unreasoning loss of nerve. You could say, therefore, that writing for print is like sculpting in stone, whereas writing for a blog is like sculpting in jelly that hasn’t quite set.

So kindly stand aside while I pour…

*FOOTNOTE: Shortly after this was posted, my learned colleague, Doug Clow, corrected the Wittgenstein quote.