Ins Stammbuch oder hinter die Ohren

Und rechnen Sie damit, dass Sie nie die perfekte Wahl treffen. Maximieren ist - angesichts der Flut an Möglichkeiten - irrationaler Perfektionismus. Geben Sie sich mit einer "guten Lösung" zufrieden. ... Nur das Beste ist gut genug? Im Zeitalter unbeschränkter Auswahl gilt eher das Gegenteil: "Gut genug" ist das Beste.
FAZ, 24. Jan. 2011

2 Wochen weiter

Tags:

Man reibt sich verwundert die sehr wunden Augen und fragt sich, was ist denn aus dem eben erst gefassten Vorsatz geworden, ab sofort pragmatischer vorzugehen und sich nicht mehr so arg stressen zu lassen? Grenzen der eigenen Leistungsfähigkeit zwingen einen immerhin dazu, Zeiten ohne Arbeit einzuhalten; das funktioniert ganz ohne Vorsätze und Zeitmanagement - aus reiner Erschöpfung.
Heute: Reihenplanung. Mahlers 2. Symphonie. Kohlrouladen. Nachmittag mit Familie. Halbjahrsnoten Teil 1 von 5. Mappen und Listen nachführen.
Und morgen geht der Spaß von vorn los.

Nullter Schultag

Tags:

Erster Schultag ist morgen, heute war erster Seminartag nach den Ferien. Manches im Seminar ist tatsächlich mit den Worten einer Kollegin treffend beschrieben: "erkenntnisfreie Zone". Immer wieder staunt man, wie groß die Unterschiede sind: Warum strengen sich manche Leute überhaupt an, engagieren sich und bereiten sich gut vor, während andere mit null Aufwand dasselbe Gehalt erzielen, von niemand belästigt werden und sich anscheinend vollkommen wohl dabei fühlen?

Getting unstuck

Slides I took with my Rolleicord 6x6 camera looked overexposed to me; but then, slide film is overexposed very easily, I have rarely used slide film at all (and with this camera, only once before), the film had been in the camera for a year and a half (but the last few frames I shot just before processing looked rather similar to the much older ones), the film may well have suffered from the summer heat ... Also, it would be surprising if the shutter of my camera was still as fast as when the camera was new, some 55 years ago.

More about circles and triangles

I'm still playing around with circles and triangles. CaRMetal is wonderful for this - much better, obviously, than the general-purpose GIMP.

circles and triangles

Tipsy Christmas cake

Tags:

Having panettone, the inebriate (and, potentially, inebriating) variant. Good stuff!

Not in my name

European leaders pick two people from a pool of European leaders to be the leaders of Europe. The people aren't asked for their opinion; in fact, most European Union citizens haven't ever heard of the two people who are now their leaders. This procedure is based on a treaty (described by its supporters as a "constitution") which the vast majority of EU citizens have never had a chance of voting on.

Three circles

3 intersecting circles

There was something about lids shaped so they can't fall into the manhole they cover (provided there's a lip under the cover which makes the hole just slightly smaller, the point being that it's unnecessary to specify how much smaller) ... Obviously a circular lid will do fine; how about other shapes?

Handbook of Applied Cryptography

I've had a lot of fun reading Simon Singh's The Code Book these last few days.
The Handbook of Applied Cryptography, by Menezes, van Oorschot and Vanstone, is available online on the University of Waterloo website.
Isn't it fascinating that there are keys which can lock but not unlock something, and keys which can unlock but not lock?

Pythagoras

Pythagoras's theorem

ABC, BCD, DEF, DFH are right-angled triangles, each congruent to each other (the same side lenghts, the same angles). AC, BD, DH, EF as well as AB, CD, DE, FH are the legs of these triangles, CB, DF their hypotenuses.

The area of the (green) square BDHG = AC2 = BD2 = DH2 = EF2. The area of the (blue) square CDEL = AB2 = CD2 = DE2 = FH2.

Syndicate content