know the dream

Dr. Martin Luther King Jr. offered this country a different kind of vision.

The Deacons for Defense and Justice offered a righteous resistance to oppression, by any means necessary, including lethal violence. The Weather Underground declared bloody war on the US Government and capitalism. The Panthers fought for a vision of equality that endorsed a racially separated nation.

But Dr. King marched with whites, and Jews, and with people so mixed that there was no place for them in a world of stark color-lines. He gave us a vision of a country where people’s opportunities were governed by the content of their character, and not by the color of their skin.

Sadly, Dr. King’s heirs aren’t as admirable. Their insistence on standing as gatekeepers of his legacy means that I can’t make a copy of the “I have a dream” video and host it on my site here. But I can link to a transcript, and to a Youtube video that probably will get taken down.

Every American should listen to this speech today. I’ve heard it dozens of times, and that’s not enough.

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ode to a white cat

Pangur Bán was written in the margins of a copy of St. Paul’s epistle by an eighth century Irish monk.

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Medieval Wool Tunic

Researchers at the University of Oslo are going to re-create an iron age diamond twill wool tunic, starting with the correct breed of sheep. The reproductions will be displayed at the University’s Museum of Cultural History and the Norsk Fjellmuseum in Lom.

There have been plenty of reconstructions of linen tunics. This particular wool tunic is the oldest complete article of clothing found in Norway, part of the Lendbreen series of finds revealed by retreating glaciers.

That pink stuff in your bathroom

No, a pink residue is not a problem with your water quality, and is not harmful in this situation. It is evidence of bacteria that are common inhabitants of our environment. The most typical of these bacteria is one known as Serratia marcescens. These bacteria come from any of a number of naturally-occurring sources, such as soil, mulch, dust, and surface waters, and they thrive in an environment that is moist and high in phosphates.

Serratia infection is responsible for about 2% of nosocomial infections of the bloodstream, lower respiratory tract, urinary tract, surgical wounds, and skin and soft tissues in adult patients.

Until the 1950s, S. marcescens was erroneously believed to be a nonpathogenic “saprophyte”, and its reddish coloration was used in school experiments to track infections. It was also used in biological warfare testing by the U.S. military as a substitute for weaponized tularemia bacteria. On September 26 and 27, 1950, the U.S. Navy conducted a secret experiment named “Operation Sea-Spray” in which S. marcescens was released by bursting balloons of it over the densely populated San Francisco Bay Area in California. Although the Navy apparently believed the bacteria were harmless, beginning on September 29, 11 patients at a local hospital developed very rare, serious urinary tract infections, and one of these individuals, Edward J. Nevin, died. Cases of pneumonia in San Francisco also increased after S. marcescens was released.

Antikythera mechanism on your wrist

Despite my well known obsession with the Antikythera device, I somehow didn’t notice Loz Blain’s excellent 2011 sildenafil samples Successful samples of generic viagra treatment: You always want a treatment that had been withered away for a long time. Utilizing the internet for getting generic levitra online drugs can save you lots of money. Secondly lack of knowledge can be one reason why this drug is very famous in so many people is due to the veins carrying less blood to cialis online mastercard those parts. Gizmag column, which pretends to be solely about Hublot’s recreation of the mechanism as a somewhat clunky wristwatch.


The White Tower

The header today is a panoramic view of the Tower of London, taken by #1 son. This is only part of that panorama – the whole thing can’t really be made to fit WordPress’s header aspect.

When I was younger I had a mental image of the Tower as something resembling a chess rook, with the heads of traitors on spikes over the portcullis and shivering naked miscreants suspended in cages from the walls.

Even though I’ve known for decades that my vision of William the Conqueror’s citadel was totally wrong (well, except the heads and cages part) I was unprepared for the sheer size and magnificence of this fortress. I wish we’d had more time to explore, and I hope we can go back some day.

XKCD Philae coverage as a flipbook

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Harpoon it, Philae!

Artist concept of Rosetta's Philae lander touching down

Edit 2014-11-14: From this blog post, a somewhat speculative plot of the bouncy landing, showing how close Philae might have come to tumbling off Churyumov-Gerasimenko and into space.

The Philae probe bouncing on landing

It’s believed that Philae bounced twice – the first bounce took about two hours, and the second one 7 minutes. As expected, the comet’s lack of mass and consequent lack of gravity has been a big challenge. At this point, it’s believed that the lander may be lying on its side, making a harpooning attempt out of the question. The drilling maneuver currently being carried out may push the lander upright, or out of the little sunlight it’s been getting, or even entirely off the comet, but there’s no way to tell just yet….

More evidence for group selection!

OK, well maybe not then.

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Historical European Martial Arts Wiki

Wiktenauer is an ongoing collaboration among researchers and practitioners from across the Western martial arts community, seeking to collect all of the primary and secondary source literature that makes up the text of historical European martial arts research and to organize and present it in a scholarly but accessible format.

More from Antikythera

Looks like the Antikythera treasure ship is not yet exhausted?

The Daily Mail’s coverage is unexpectedly better than the BBC‘s, despite the usual Daily Fail sidebar of celebrity gossip.

http://www.youtube.com/watch?v=MqhuAnySPZ0

Duck and Cover

For some reason I always remember this as “Tommy the Turtle”. Good thing youtube has a copy to set me straight.



This is from 1951, but these kind of films were still being shown in the late 1960s and early 70s in Delaware elementary schools. In the first couple of grades, they had us crouch under the desks with our hands behind our heads for A-bomb drills, but later they started having us go into the hallways and huddle against the walls. Pretty much the same as California earthquake drills, only with deadly fallout expected afterwards.

948 A.H. today

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Viking hoard in Scotland

More than a hundred items. The Beeb has pictures.

Pleistocene Art in Indonesia!

A team of archeologists working in the Maros karst caves of Sulawesi, Indonesia have found paintings that appear to be at least 40,000 years old. These paintings strongly resemble well known European cave art of the same time period, showing that there were common art forms in use on opposite sides of the world forty thousand years ago, implying human art is much older.

Here, using uranium-series dating of coralloid speleothems directly associated with 12 human hand stencils and two figurative animal depictions from seven cave sites in the Maros karsts of Sulawesi, we show that rock art traditions on this Indonesian island are at least compatible in age with the oldest European art. The earliest dated image from Maros, with a minimum age of 39.9 thousand years, is now the oldest known hand stencil in the world. In addition, a painting of a babirusa (‘pig-deer’) made at least 35.4 thousand years ago is among the earliest dated figurative depictions worldwide, if not the earliest one. Among the implications, it can now be demonstrated that humans were producing rock art by aproximately 40 thousand years ago at opposite ends of the Pleistocene Eurasian world.

The paper is paywalled here, at Nature Magazine’s website. The précis is quoted above.

“Coralloid speleothems” are a particular type of stalactite, formed of layers of diatom colonies, detrital minerals and clay. Because the diatoms were water-dwelling living creatures, the Uranium series dating technique is applicable to the speleothems. By determining the age of diatom colonies that have formed on top of the paint, minimum age of the cave art can be approximated.

Armor gymnastics

https://www.youtube.com/watch?v=5hlIUrd7d1Q

Craptacular Eskimo Fan

Heather bought another old fan at the Arden Fair a few weeks back. It’s a single speed oscillating Eskimo with aluminum blades from the late 1930s. It has a somewhat attractive pseudo-Deco design with a spiderwebbish pattern to the cage.

Dissassembly revealed not only unbelievably thick crud deposits (half an inch of greasy fur inside the casing) but also the cheesiest design and materials I have ever seen in an antique fan.
EskimoFanOpen
The shaft bearings are thin and very yellow, very little copper content. But not all of the bearings are even metal! Some of them appear to be made of greased cardboard. The stator windings are literally bound with masking tape, although the wire nuts are porcelain. Two of the gears in the oscillator box are made of masonite – steam-pressed wood fiber. The worm gears they engage are steel, so don’t grab the fan and prevent it from oscillating unless you enjoy the sound of masonite gear teeth snapping off. The blade is soft aluminum, so soft that sticking a finger into the cage will almost certainly unbalance it… two of the blades are already bent, so that it vibrates noisily and the main shaft sidles erratically in and out like a trombone slide.

Even without the blade mounted it still sounds like a gravel crusher and the main shaft wobbles all over the place, because the squirrel cage rotor has never been balanced and all the cheesy bearing surfaces are worn out. If you push the oscillator shaft bearing up into the housing with a penknife it’ll swing back and forth wildly, at surprising speed, until the shaft bearing flys back out and the gearing disengages. I guess with a 2-pole stator and a 15-pole rotor you can’t expect smooth operation? The fact that the oscillator must have fallen apart almost immediately is probably what preserved those masonite gears.

Generous and repeated use of PB blaster, WD40, degreaser, and ultrasonics have given this piece of junk an interesting wabi-sabi patina that I kind of like, so I’m thinking about replacing all the bearing surfaces with bronze, and seeing if I can reshape the blade to restore balance. Planishing fan blades is always a big challenge, though.