Excellent MythTV Notes and HOWTO

This site seems to be an excellent MythTV HOWTO and collection of notes.

Time Warner Cable ISP and Privacy!

Clark Howard discussed Time Warner's privacy policy on the air on 27 Sep. Here is a quote from his show notes on clarkhoward.com (as linked above). I wonder what Comcast's policy is? (Obviously, I should go and (re!)-read it.

Time Warner's privacy policy treads 1984 ground

Do you hate legal mumbo-jumbo? Well, consumer reporter David Lazarus recently read through Time Warner's entire 3,000 word privacy policy and terms of service. What he discovered is that Time Warner reserves the right to track the Internet habits of its high-speed customers. This info includes what websites you visit, how long you spend on them and what e-commerce purchases you make. They can also read your personal e-mails, according to the terms of service. Time Warner is also allowed to disclose personally identifiable info about its customers to advertisers, direct mail operations and telemarketers for a price. A company spokesperson claims they're not doing all this just yet, but Clark wonders why Time Warner is even allowed to reserve the right to totally invade your privacy. And it's not only Time Warner that has these kinds of policies -- AT&T tracks very similar info on its customers and records their TV viewings habits. While it's never good to look reflexively to Washington for a solution, Clark believes in this case we need an ironclad privacy policy from Congress to protect the privacy of your viewing and surfing. After all, would the CEOs of Time Warner and AT&T -- or those on Capitol Hill -- like it if the public saw every one of their e-mails?

New Google 411 Service

The new Google voice-recognition 411 service is very cool. Check out the video.

Gmail Unread Mail

Okay, looking on Google groups I found out how to do something I've been needing, wanting, and wondering about for quite a while: How do you search for Unread email?

It turns out that apparently, Unread is a hidden label. So, you can put this in your search field:

label:unread

OR, if you want to search another particular label for unread email:

label:unread label:ImportantMessages

New Job

I've never posted my biggest news here. After 22 years I left Emory and moved on to new employment. My last day at Emory was actually 20 July 2007, so this post is a little late.

Who's my new employer? You have to ask me for that information.

I'm still in IT, still in Linux, still doing basically the same things at the same level that I was before.

I started the new job on 6 Aug.

Boot 145 OS on One PC

Okay, 145 OS' beats my old 10 on my Fry's PC!

Scale of the Universe

Someone recently posted an article explaining the scale of the universe via various analogies. We do have a hard time percieving a wide range of scales where distance is involved. However, humans seem to have a perception of time that has a large dynamic range. So, I've found the best way to talk about the size/scale of the universe is in terms of light-travel time. (In other words, how long would it take light to travel that distance).

• to the Moon - ~1.25 seconds
• to the Sun - eight minutes
• to Pluto - about four hours
• to Alpha Centauri - about four years
• to Sirius - about eight years
• to the Orion stellar complex - about 1500 years
• to the center of our Milky Way galaxy - 30,000 years
• Diameter of our Milky Way galaxy (visible arms) - 100,000 years
• To M31 the Andromeda Galaxy - 1.5 million years

Other clusters of galaxies are typically at distances with a light-travel time in the realm of 100 million years. All of these distances are approximate.

Oh, and you can basically ignore any talk of distances to the farthest galaxies, clusters, or talk about the size of the universe or distance to the edge of the universe. Most of those distances are highly model-dependent, and the concept of distance barely applies. After all, everything is moving on cosmological scales, the universe is expanding. That's all another discussion.

RIP Tom Snyder

RIP Tom Snyder. I always enjoyed the Tomorrow show and later the reincarnation on CNBC. In addition the pretty well-covered history in this article, I thought the tight, close-up shots they used were pretty cool.

Python Now

Okay, I've been using Python for a handful of months. I've gotten over the white space as langauge element business. I still don't favor it, but I get it. I personall still prefer braces or something like them for delimiting statement blocks, but I can live with the white space.

There are two unforgivable sins in Python.

The first is that instance variables and method names in an object class definition occupy the same name space! This means you can't have a variable called file and then a method to get/set it cadlled file(). As soon as you write a value to the variable (self.file = something) you've overwritten your method definition! Am I missing something here?

So you either have to use the built in direct access obj.file = something which you can do directly to set (and get), but you've lost the ability to massage data as you set or get it. Or you have to resort to obj.get_file() and obj.set_file(), or a method that does both.

Okay, I forgot what the second one was.

Update 18 Oct 2007: Okay, there is a way. See this post.

Crossing the Rings of Uranus

From Sky and Telescope, the Earth will cross the rings of Uranus for the first time since their discovery!

On Thursday, August 16th, Earth will cross the equator and ring plane of Uranus, and astronomers all over the world will be on watch. The unusual geometry offers a unique view of the planet's atmosphere, satellites and ring system.

…

Uranus's orbital period of 84 years means that we get ring-plane crossings only every 42 years. During the last one, in 1965, little was known about the distant planet, the ring system hadn't been discovered, space telescopes sounded like science fiction, and the 5-meter Hale telescope on Palomar Mountain was the world's largest.

Seth sent over this interesting take on the Internet.

Periodic Table of the Internet

Comet Linear C/2006 VZ13

From Sky and Telescope:

Comet LINEAR (C/2006 VZ₁₃), now crossing through Draco and Boötes, has far exceeded expectations. It was originally predicted to peak in brightness around magnitude 10, a pleasant spectacle for people who enjoy viewing faint comets through telescopes. But the latest magnitude estimates range from 7.5 to 8.0, making it an easy sight through 10×50 binoculars in a dark, transparent sky.

As of July 10th, the comet appears as a bright, round fuzzball roughly 8' across, with little hint of a tail. It will probably peak in brightness shortly after July 14th, when it comes nearest to Earth. Then it should fade gradually until perihelion, its closest approach to the Sun, on August 10th. But it will be disappearing into the evening twilight by the end of July.

Who's the Emptiest?

So after the amazing web page, Seth and I embarked on a discussion of emptiness, where I claimed:

Other things, the Solar System, and even galaxies are similarly sparse. I find it fascinating that two galaxies can pass through each other with probably no stars colliding. (Gas, however, is a different matter, uh...so to speak, and gravitational, tidal forces are really, really a different matter!)

Which led to an interesting question. Which of these is the emptiest? My first intuition was that the average distance between objects, cubed, would give a rough indication of emptiness. Now, as I write this, it's obvious that emptiness is just density. In this case we're talking about particle density (things per cubic-length) and not mass density (grams per cubic-length).

Here's my first, rambling shot at the question.

As a start, the Sun is about 100 Earth's in diameter but the nearest star is four LY away which is about 24e12 miles. The earth's diameter is about 8000 miles, right? (I never can remember, but we are headed east at about 1000 mi/hr meaning the circumference is about 24,000 miles and over pi * d gives 8000 as d).

That make the Sun about 8e5 miles in diameter. So the nearest star distance is 24e12 / 8e5 = 3e7 diameters.

The web page you sent says the proton diameter to atom diameter ratio is about 1e5 so that makes a galaxy maybe 300 times emptier [sic] (3e7 / 1e5 = 3e2), or taking it in a volume sense, (3e2)^3 = 9e6 =~ 10 million times emptier. Wow. I wonder if that's right...

Now take the Solar system. If the Sun is 8e5 miles in diameter, we know the earth-sun distance is about 93e6 miles. 93e6 / 8e5 =~ 12e1 = 120. So the Earth is only about 120 solar diameters away so the solar system isn' t nearly as empty as an H atom. By volume 1e5 / 1.2e2 =~ 8e2. By volume (8e2)^3 =~ 6e8 so the atom is 600 million times more empty!

Neptune is at about 35 AU I think so that makes it about 4000 diameters, still less ``empty'' than an atom.

H-Atom Scale Model - 11-Mile-Wide Web Page!

Seth sends this link that is the coolest, most clever, and shocking thing I've seen on the web!! It's a scale model of a hydrogen atom.

It's a relatively simple web page with an electron as a single pixel, a proton as an image 1000 pixels across, and enough pixels between them that, at 72 pixels/inch the web page itself is 11 miles wide!!! That said, at least in Firefox it renders instantly and you can easily scroll to the right where the electron is.

Fascinating!!

China Practices Weather Control

This is a fascinating story of China practicing weather control.

Basically they're seeding clouds with silver iodide, but on a fairly large scale. Using anti-aircraft guns is an interesting approach.

Time and Time Again

Here are two excellent references on time scales and their history.

http://www.ucolick.org/~sla/leapsecs/timescales.html

http://stjarnhimlen.se/comp/time.html

Monolith

After something like 15 years, I have stopped receiving email on Monolith. A few minutes ago I changed the forwarding address in LDAP to forward email off-campus exclusively.

Monolith began as a NeXTslab computer on my desk top. It was my main workstation from the early 90s until maybe about 1997. The system was first set up in my office in Uppergate House, then made the move to Cox Hall. It also went with me for the brief stint in the University Apartments Tower penthouse. Sometime in 1997, when I moved from Cox Hall to the North Decatur Building, Monolith's soul moved to a SPARCstation 5 and Solaris 2.5.1. In later years it evolved into an Ultra 10, then a Sunblade 150. The OS probably made its way through Solaris 2.6, and maybe Solaris 9. I don't recall if it was ever Solaris 8.

For the past few years, Monolith left my main workstation and became a more humble Debian Linux box running on a Pentium II system with 96 MB of RAM and a 4-GB hard drive. It's been serving it's main duties as an email server (running Exim for the MTA and Cyrus IMAP), and a web serve running Apache. For the past six months, Monolith has been hiding in the machine room on the fourth floor of the Woodruff Library.

Today I'll shut down the web server and email services and then will remove the box sometime this week.

Keyboard Type in Ubuntu

Here's a question: Where is the keyboard type stored in Ubuntu Linux, or in Linux in general?

The answer is, in the file /etc/default/console-setup.

Upstart Replaces Init

Though I knew that the Ubuntu project had replaced init(1) with a new scheme, I've largely ignored it until now.

Here's a nice article on the rationale behind the change.

Here's the Upstart home page.

Quote of the Day

Okay, this is a good one. From Michael's signature…

First we thought the PC was a calculator. Then we found out how to turn numbers into letters with ASCII — and we thought it was a typewriter. Then we discovered graphics, and we thought it was a television. With the World Wide Web, we've realized it's a brochure.

—Douglas Adams