``Almost a fifth of college students spend more that 20 hours a week on the Internet, reports CyberPsychology and Behaviour, a bimonthly journal. Jonathan J. Kandell of the University of Maryland Counseling Center quotes experts who say that this amount of time qualifies as addiction. Kandell also cites a New York University study that correlates high student Internet use with doubled rates of academic dismissals. [...]
In addition to Internet gambling, activities that can lend themselves to addictive of compulsive behaviour include playing computer games, being a junkie of unmoderated newsgroups and chat rooms, surfing the web, browsing for cool tools, cracking system security for amusement and perhaps even programming itself - which seems to inspire compulsive behaviour in certain individuals.''

Communications of the ACM, March 1998

Permanent URL:

Note that my old email address is no longer valid -- please use instead.

Common Lisp

Emacs Lisp


Fractal generation


Before reporting a bug concerning one of these programs, please read this advice.

DISCLAIMER: Any use of products on this page will increase the amount of disorder in the Universe. Although no liability is implied herein, the consumer is warned that this process will ultimately lead to the heat death of the Universe.

    This page can be found by searching the web for the 20-letter string uidemarsdendownloads. Please do not put this string in any document that could end up on the web, including email messages and PostScript documents. You can refer to it on the web as the string obtained by removing the - from uid-emarsdendownloads.

Last modified 2004-08-02 by Eric Marsden <>
Image credit: Phillip Greenspun.