Monthly Archives: January 2001

January 13 2001

Mathematics

The MacTutor History of Mathematics archive has biographies of about 1350 mathematicians (and physicists), articles about mathematical education, and much more! Look at the 10 % of all biographies that are consulted most often to get an idea of what’s available.

Traveling

Booktailor lets you create your personal travel book as a book on demand. You can choose chapters by destination and interests.

“We’ve brought together information from leading books, newspapers, magazines and websites: just tell us where you’re going and what you’re interested in and we’ll help you create your very own personalised travel guide.
[…] We won’t sell you an airline ticket or arrange your holiday for you, but we will print and bind the book you’ve created and deliver it right to your door. […] Prices range from £9.99 to £34.99, plus postage.”

Guten Appetit!

Atlantic Monthly:Why McDonald’s fries taste so good. It’s all in the cooking oil.

The article is about natural/artificial flavour and colour in food.

“Studies have found that the color of a food can greatly affect how its taste is perceived. Brightly colored foods frequently seem to taste better than bland-looking foods, even when the flavor compounds are identical. Foods that somehow look off-color often seem to have off tastes. […] During one experiment in the early 1970s people were served an oddly tinted meal of steak and french fries that appeared normal beneath colored lights. Everyone thought the meal tasted fine until the lighting was changed. Once it became apparent that the steak was actually blue and the fries were green, some people became ill.”

Link via BrainLog.

star:

Diese Woche in der Zeit

Medizin: Rettung aus der Kloake. “Mit einfacher Biotechnik bekämpfen georgische Forscher tödliche Krankheitskeime”

“Als die staatlichen Gelder noch flossen, unterhielt das Institut ein ausgeklügeltes Therapiesystem: Krankenhäuser schickten die Bakterien nach Tiflis, die nicht mehr auf Antibiotika- oder Virenbehandlung reagierten. ‘Wir analysierten die Mikroben und suchten in der Sammlung nach wirksamen Phagen’, erzählt Zemphira Alavidze. ‘Fanden wir keine, fischten wir sie aus dem Abwasser des Spitals, aus dem die Keime stammten – das ist die beste Quelle.'”

Rinderwahn: Die Spur zum Stall. “Ein neues Verfahren offenbart die Herkunft von Rindfleisch. Zur Überwachung eignet es sich besser als großflächige Gentests.”

“Um zu analysieren, woher ein Stück Rindfleisch kommt, untersucht Boner das Sauerstoff-Isotopen-Verhältnis in der Gewebeflüssigkeit der Probe. Gleichzeitig verbrennt er einen getrockneten und zermahlenen Brocken Fleisch und untersucht die Kohlenstoffmischung. Wie viel von einem Isotop sich im Steak ansammelt, hängt nicht nur von der Weide ab, auf der die Kuh stand, und aus welchem Bottich sie gesoffen hat. Da spielt auch das Futter eine Rolle und welchen Weg das Vieh dann nimmt, bis es zerlegt in der Kühltheke landet.

[…] Durch den Vergleich mit einer Originalprobe aus dem jeweiligen Land kann Boner ermitteln, ob die Herkunft eines Tieres richtig angegeben ist. Der Lebensmittelchemiker traut sich sogar zu, einen in den Papieren genannten Hof als Heimat eines Rinderbratens zu bestätigen oder auszuschließen.”

Physik: Von den Socken “Der Streit um geisterhafte Fernwirkungen in der Quantenmechanik dauert an.”

“Worum geht es in dem Sockenstreit? Zunächst um die Fußbekleidung des Physikers Reinhold A. Bertlmann, die links und rechts stets unterschiedlich ist. Denn seit seinen Studientagen hat Bertlmann (der nicht etwa “hypothetisch” ist, sondern tatsächlich existiert) die Gewohnheit, Socken verschiedener Farbe zu tragen. Er lehrt heute an der Universität Wien, und auf seiner Homepage lassen sich die berühmten Socken bewundern.”

Mathematik: Chaos hilf! “Wird dank der Quantenphysik die Riemannsche Vermutung endlich bewiesen?”

“Als der englische Mathematiker Godfrey H. Hardy vor einer stürmischen Schiffsreise glaubte, den Beweis der Riemannschen Vermutung gefunden zu haben, war ihm das ein Zeichen, dass ihm bei der riskanten Überfahrt nichts zustoßen könne. Denn käme er im Sturm auf See um, so folgerte Hardy, würde er posthum dafür gefeiert, das berühmteste mathematische Problem geknackt zu haben, und das würde Gott nicht zulassen. Tatsächlich überlebte der britische Mathematiker die Überfahrt – das Geheimnis der Riemannschen Vermutung allerdings auch.”

January 11 2001

More troopers

And here is my favourite trooper! André doesn’t think the similarity to be striking, but I think the hair and the glasses look pretty much like they really do. Compare his trooper to his picture in the entry below!

André also found this gallery of about 3 dozen Blogging StorTroopers (& friends).

me as trooper: I’m a trooper

Okay, so I did it too. Because Everyone else is doing it, too!

Go to storTroopers to create a picture of yourself. By the way, I created two storTroopers, and when I hit the ‘Save’ button, my browser crashed – both times. When I restarted my computer and reloaded the page, the image I had created before the crash appeared properly on the right side of the page. I wonder why that happened… (I used IE 5.0 on MacOS 9.)

Pictures, pictures!

Susan has some wonderful photos of San Francisco at night!

How sane am I?

I just found a link to a sanity test on BookNotes. And it says: “You are 14.5454545454545% insane. – You are what the government would have us believe is normal.”

Oh, and by the way, I think a sanity test that seems to give results in periodic decimal fractions is about 99.9898989898989% insane.

Update: Craig says I shouldn’t feel bad – he thinks I’m at least 43.6363636363636% insane, too. Hmm… is that a compliment? wink:

United States Postal Service

The USPS seems to be very reliable – and even has a sense of humor! The Annals of Improbable Research conducted some postal experiments and successfully mailed items like an unwrapped pair of tennis shoes, a $20 bill in a clear bag, some old cheese, a molar tooth, and a wrapped brick:

“Wrapped in brown paper […]. Extreme weight for size made package seem suspicious. Notice of attempted delivery received, 16 days. Upon pickup at station, our mailing specialist received a plastic bag containing broken and pulverized remnants of brick. Inside was a small piece of paper with a number code on it. Our research indicates that this was some type of US Drug Enforcement Agency release slip. The clerk made our mailing specialist sign a form for receipt.”

Link via MetaFilter.

Lunar eclipse

CNN has a photo gallery with wonderful eclipse photos from Europe and Africa. (Yes, that’s the photo gallery from the article Sheila linked to the other day…)

Link via Sushma Kishore.

January 10 2001

Astronomy

New York Times: Found: 2 Planetary Systems. Result: Astronomers Stunned., by John Noble Wilford.

Link via Garret.

Today’s trip to the USA

I’ve been traveling today – I went to see Glen Canyon, Grand Canyon and New Mexico.

Glen Canyon

I read Glen Canyon: Images of a lost world by Tad Nichols. André gave it to me for Christmas.

It is a wonderful, beautiful book. Nichols used to visit Glen Canyon with two friends for several years, right before the dam was built and Glen Canyon was lost. The book contains many black-and-white photos from Glen Canyon and its side Canyons, many of which Nichols and his friends named.

From looking at the pictures and reading the book, I got the impression that Glen Canyon was one of the most beautiful places on earth, and it’s incredibly sad it has been destroyed by the dam.

Gary Ladd writes in the afterword:

“I think it is nearly impossible for those of us who arrived after 1963 to comprehend how much Tad, Frank and Katie’s canyon meant to them. However, I am beginning to understand because today a second wave of loss sweeps Glen Canyon and slickrock country everywhere as a flood of visitors and deluge of regulations inundate the sweeping stone landscapes. It’s no longer possible to enjoy the freedoms of Glen Canyon or any formerly obscure and winsome canyon. It is history. […]

There is, though, one deeply consoling fact: Glen Canyon will return. We know it will because we know that dams far more massive and far greater than Glen Canyon Dam have swamped Glen Canyon before. It has happened at least twice in the last million years when volcanoes erupted in western Grand Canyon, backing water up as far as Moab, Utah. Lake Powell, like all lakes, natural or man-made, is ephemeral. In due course, Glen Canyon will breathe again. It cannot be otherwise.”

Grand Canyon

I visited Grand Canyon and New Mexico on the internet, at photo.net.

Phil Greenspun, creator of the photos, went rafting through the Grand Canyon in 1999 and took a bunch of photos, some of which reminded me of the photos of Glen Canyon. Scroll down the page to Out of the Canyon and into a Slot Canyon.

New Mexico

Greenspun toured the land of enchantment in 1994, and some of the photos are quite spectacular, e.g. those of Chaco Culture National Historic Park or the Great Sand Dunes National Monument (yes, that’s in Colorado, but it’s on the New Mexico page anyway.), or Santa Fe. (Did you know that by law, structures in the center of Santa Fe must be built from adobe?)

Wow, Garret, you really live in a beautiful place!

Update: Garret informs us that “there are actually two or three building ‘styles’ allowed in santa fe city. pueblo, territorial, and (i believe) northern new mexico. each has a distinct look, yet all must be made to look like the historical adobe forebears of the style. and, as i’ve said before, everyone must adapt. mcdonald’s, burger king, walmart … they’re all adobe. […] municipalities don’t have to accept neon nightmares.”

Souds a bit like Celle, André’s home town. It’s famous for its Fachwerk buildings (‘half-timbered houses’, says the dictionary), and even McDonald’s has one with a brass plate instead of their usual neon sign (here’s a photo of McDonald’s in Celle).

star:

Lunar eclipse

Yes, Sheila, yesterday’s photos are of the lunar eclipse. I meant to write a short note in English, but forgot. Sorry!

The first, top left photo was taken just as the moon started to enter the earth’s shadow. The bottom right photo shows the last bit of the moon before it was completely covered, and from the poor quality you can see that the sky was almost completely overcast by then. We couldn’t see the eclipse itself at all.

Sheila links to Lunar eclipse offers spectacular show. Well, maybe it did, but certainly not here in Bonn, because it got cloudy before the moon was completely covered by the earth’s shadow.

By the way, the clouds went away after midnight – two or three hours too late!

Okay, off to work now…

January 9 2001

Weblogs

Thanks to Craig, I have discovered Cabinet, another cool weblog. So far, I’ve only checked this year’s entries, but it looks pretty interesting so far. Their tag line is “It isn’t whether or not it’s real, it’s just that it’s true.”

I also discovered WebsMostLinked on Cabinet, a site that monitors close to a million of websites and ranks them by the number of links they receive. So if you’re already at the top of the HotList, check your site at WebsMostLinked!

Finster ist der Mond… und der Himmel

Seit einer knappen Stunde verfolge ich nebenbei die Verfinsterung des Mondes. Leider sind die Bedingungen nicht die besten: Weil es so kalt ist, gucke ich nur aus dem Wohnzimmerfenster. Und hier, mitten in der Stadt, gibt es natürlich auch eine Menge Hintergrundbeleuchtung. Außerdem ist es irgendwie diesig oder nebelig, so daß man nicht viel vom Mond sieht.

mofi1: mofi2:

Bei der ersten Aufnahme um 19:47 Uhr (oben links) war es noch einigermaßen klar, von ein paar Wolken abgesehen. Die beiden nächsten Fotos entstanden um 20:01 Uhr (oben rechts) und 20:19 Uhr (unten links), da wurde es schon schlechter.

Und kurz bevor der Mond ganz verfinstert war (um 21:41 Uhr, unten rechts), war auch der Himmel fast ganz verfinstert…

mofi3: mofi4:

Jetzt sieht man überhaupt nichts mehr. Mal sehen, ob es innerhalb der nächsten Stunde noch aufklart, so daß wir wenigstens noch einen Blick auf den verfinsterten Mond werfen können.

Update: Sieht nicht gut aus. Jetzt ist es ganz bewölkt. Kein Wunder, denn für morgen vormittag ist hier Schnee(regen) angekündigt.

Bilder von der Mondfinsternis gibt’s aber z.B. hier auf Astronomie.de.

Mondfinsternis

Heute abend ist Mondfinsternis. Jörg hatte gestern den passenden Link: Lunares Schattenspiel zur ‘echten’ Jahrtausendwende (bei Telepolis).

Also, heute abend zwischen 20:50 Uhr und 21:52 Uhr (Kernschattenphase) auf klaren Himmel hoffen und in selbigen schauen!

Manila Newbies

This is a useful page: Admin: Page Adresses.

Link via Manila Newbies Mailinglist.