Security by obscurity

Today I got a mail from a specialist on computer security. His name appears on a web page I did for my school some years ago, he asked for his name to be removed, as his private background should not be on the web. I already forgot that the page existed and of course I have no clue what the password was... So, I mailed him that I will remove the page as soon as I find the password. Hurray for showing competence :-)

A disgrace to all craftsmen

Today I wanted to get the battery in my watch changed. It is a swatch, so nothing fancy. It eats standard batteries. So I went to a, well, not a clockmaker, not even a shop who sells watches, more like a shop who tries to sell watches but failing.

The sales drone there was the most incompetent sales drone I ever met. He stared at the swatch as he had never seen one before and then said they don't have that type of battery (which might be true) and he didn't want to change the battery because he didn't know how to do it. Well, changing the battery of a swatch is an artform which only the best craftsmen ever manage. You take a 10cent coin, put it in the slit of the battery compartment and then turn the battery holder about 10 degrees counterclockwise. Then it falls out, you change the battery, put it back and turn the thing in the other direction. That's hard to do. I know. But sometimes people master this craft...

Worse yet, in the house that shop is in Emmy Noether was born, one of the greates mathematicians. What a step down.

Then I went to another watch-shop, a very good looking and nice girl changed the battery in about a minute, chatted a bit with me, set the watch correct and was generally nice. Much better...

Incompetnce

I had to to an exercise sheet for the first year students. As most of the exercises I found in books were either shite or wrong (or both), I tried to do some of my own. I dug out the paper of Henry Cavendish, were he determined the density of the earth with his famous torsion balance. I calculated everything with his measurements. It took about two days until I had understood what he did and ended up at a Gravitational Constant which made sense.

I made an exercise out of it. I had to simplify it a bit, because the students did not yet know the torsion pendulum. While simplifying it, I introduced a couple of errors, which went unnoticed but made the complete calculation bollocks.

I had another exercise on an hammer bouncing off the floor where I mixed up elastic and in-elastic bounces.

When doing the example solution to the problems, the one which all other tutors would read and use to correct the exercises, I made about every possible error and mis-calculated about every quantity at least twice. So it took me about 8 or 9 iterations (all sent around to all tutors) to have a solution sheet, which was nearly right (I didn't find the errors myself, btw.). I think I should quit doing my PhD, hand back my diploma and do a ritual suicide. That would be the correct outcome of this. As I have met people who are even more incompetent and got away with it, I will wait a bit, maybe I can get away with it too...