Usefull stuff

google scholar

UT library

EPrints

Wikipedia

Mathworld

gnuplot tips

nu.nl

buienradar

knmi

9292 OV

Personal interests

Jaspers Cryptogrammen Site

Wimjans puzzelwoordenvinder

Jaap's Puzzle Page

ambigrams

Wiskundemeisjes

Wild about Math

blinkdagger

xkcd.com