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Well, Conrad Barski has done it again - produced another tutorial that distils the essence of a complex subject into something that anyone can understand (his earlier tutorials covered Lisp macros, Emacs tagging, and Lisp web servers). This one is on Knowledge Representation and it is quite a good intro (Note: some people had trouble accessing the site and others had no trouble at all - might be a DNS issue, so try back later if you have problems). As he says on his blog:
"When it really comes down to it, the biggest mistake you can make in writing is to be boring - Actually being right in what you write is a nice bonus, though..."
Conrad Barski's writing is definitely not boring! ;-)

How to tell stuff to 
									  a computer

The sections are: If you're interested in KR, you might also be interested in having a look at Ralf Möller's ILC2007 presentation Building a Commercial OWL Reasoner with Lisp (it's not available online yet; however, the ILC2007 presentations are supposed to be available online soon, so keep checking back). Also, Franz is hosting a free web seminar titled Understanding Web 3.0 Database Technology - if you're interested in Knowledge Representation and it's uses, this looks to be a good one to see. It's this Wednesday April 11, 10:00 - 11:30 am Pacific time.
Cory Doctorow:
This simple, terrific tutorial explains how to photoshop any photo into a Roy Lichtenstein-style pop-art image. It looks like it would be readily adaptable to free Photoshop alternatives like The Gimp, too. Link (via Red Ferret)