Good evening,

on Monday it was about keeping flamingos, today we will deal with the cathetus set.

Don't say you can't get around this newsletter!

As a reader of a FAZ newsletter, you are of course a clever head and you know: The cathetus principle says that the square above a cathete in a triangle is equal to the product of the adjacent axis intercept of the hypotenuse and the hypotenuse itself.

You can do that, you do the math while half-asleep, but do today's students still have to learn that?

Gerhard Köhler, director of the old-language Frankfurt Gagern-Gymnasium, has an astonishingly pragmatic attitude for a school principal: Young people can learn, but they don't have to.

Manfred Koehler

Deputy head of the regional section of the Frankfurter Allgemeine Zeitung and editor in charge of the business magazine Metropol.

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Doesn't play a role in the further course of life.

How did he come to say that?

Because the question now arises as to which part of the course material that was missed during the difficult times of the pandemic is now being made up for.

The set of cathets could fall down at the back, otherwise it would be better not to.

Our school expert Florentine Fritzen spoke about this not only with the director of the Gagern-Gymnasium, but also with two other headmasters.

Of course, bright minds like you also know how to calculate the volume of a slightly tapered drinking vessel if you know the size and height. Others say what interests me about the volume as such, what is important is what is inside! Well, apple cider, for example. The journalist Laszlo Trankovits has written a book about the Frankfurt national drink, which introduces "111 places around the Äppelwoi", so the title.

Colleague Matthias Trautsch has read it and reported that, according to the expert, who took on the heavy burden of immersing himself in the world of Ebbelwei economies for two and a half years for research, apple wine is a crisis profiteer: Many young people who otherwise Had gone to clubs or bars, would have discovered the culture around the apple in the pandemic. Then let's hope it stays that way.

Two or three Sauerspritzte definitely help if you hesitantly venture up to the Römerberg in the run-up to Christmas to see what it will look like this year, the Christmas tree at the Christmas market. Not only older Frankfurters know horrific stories to tell of unsuccessful specimens. But this year everything will certainly be better. This year the spruce comes from the Spessart, is called Gretel and is 30 meters high, and in the first photo it is radiantly beautiful.

Well, she still has an exciting transport to the Main metropolis ahead of her, but let's hope for the best.

If you still feel like it after three pissed-offs, you can prove the cathetus set in December when you see the measurements of Gretel, narrow at the top and wide at the bottom, so a bit like a triangle.

But it doesn't have to be.

Doesn't matter in further life.

And in addition, Thomas Guggeis will become General Music Director of the Frankfurt Opera, he comes from Berlin +++ the biotech company BioSpring from Frankfurt is one of the companies that was awarded the prestigious “Hessen Champion” prize on Tuesday +++ the Bund für Umwelt und Naturschutz complains against the planned Wiesbaden residential area called Ostfeld.

I wish you a pleasant evening

Yours Manfred Köhler



for Wednesday

The day starts with some fog fields.

Later it is friendly and dry.

Temperatures between 5 and 15 degrees.






Wolfgang Hessenauer

(SPD), Chairman of the Wiesbaden Workers' Welfare Association, City Elder, former Head of Social Affairs for the City of Wiesbaden (79);

Burkhard Wagner

, former head of the Mercedes-Benz Frankfurt / Offenbach branch and sales director for cars and vans for the Rhine-Main region (60);

Susanne Eickemeier

, Chancellor of the Hochschule für Gestaltung, Offenbach (56);

Sabine Baumann

, publishing editor, chairwoman of the association "Frankfurt reads a book" (55);

Christof Fink

(The Greens), First City Councilor of Oberursel (47).