The useful knowledge

Immanuel the wise wrote:
It is a real joy to see the ardour with which the older geometricians investigated these properties [of conical sections], not allowing themselves to be troubled by the question which shallow minds raise, as to the supposed use of such knowledge.
Some of my dear scientific peers seem to be assailed by the question tha

And on the seventh day, He rested

But what He should have done was revising.

Statistical Significance

This following dialog takes place in a hypothetical conference, a poster session, where scientific truth is sought for. A PhD student presents his latest data, about a particular phenomenon, quantified and plotted to the best of his knowledge. A prominent, statistically minded visitor regards intently the histogram plot in the poster. The visitor skeptically inquires:
- But it is statistically significant?
The student considers the question for a moment. He returns the intense stare of the visitor and defiantly replies:
- But are you?

The Meaning between Words

300 pages in one shot.The meaning is there,
between the words.
In the space
between the words
anyone can drawmeaning.
(thanx to

The prickly problem of induction

We scientists (while logicians)are left greatly perplexedwith the prickly problem of induction(vide Rudolf)What is the problem?c aseca secas ethen rule?this is no proof!induced,merely intuited,may be indicted,not vindicated!Now.Humans are induction toolscase case case ruleno problem!Humans are induction toolsand this alone is evolution's sufficient proofthat induction works.Sorta.

Scientist: the ventriloquist of nature

he believesthe puppet to bethe one sayinghis wordsbut it's notit is he whois the puppetand those are nothis wordsthose are strings,waves that vibrate,rever berate,with the soundsof his nature

personal reminder: Convert Nikon NEF to JPG with ufraw

$ ufraw-batch --out-type=jpeg --out-path=/home/itsme/Pictures/export --compression=85 --size=1280 /media/Data/home/itsme/Pictures/MyPics/*.nef
for more details cf.

howto copy CalendarServer (content) - use rdiff-backup

rsynced a complete and functional copy of CalendarServer to another drive (and to another file system). afterwards, the server started and didn't complain but didn't show any calendar (but still logged in and didn't complain about anything - just no calendar!).tryied rsync -aA, rsync -rlpAtgoD (long version - one never knows...), and cp -a - but all to no avail.finally, i tried rdiff-backup -b - and this worked... why?

personal reminder: building debian packages from source

...for future reference:
  1. apt-get source (-t testing) PACKAGENAME
  2. apt-get build-dep (-t testing) PACKAGENAME
  3. cd PACKAGANAME-version
  4. OPT: vi debian/rules (e.g. to activate some experimental features)
  5. OPT: vi debian/patches/00list (to enlist a patch that should be applied)
  6. OPT: vi debian/patches/...

apt-listchanges chokes on its DB (bsddb.db.DBRunRecoveryError)

in case of:
Traceback (most recent call last):File "/usr/bin/apt-listchanges", line 229, in ?main()File "/usr/bin/apt-listchanges", line 150, in mainseen.close()File "bsddb/", line 237, in closebsddb.db.DBRunRecoveryError: (-30974, 'DB_RUNRECOVERY: Fatal error, run database recovery -- PANIC: fatal region error detected; run recovery')
(similarly to the post below) something along the lines of:
cd /var/lib/aptdb4.6_dump listchanges.db | db4.3_load temp.dbmv temp.db listchanges.db