Computing
The wonderful world of early computing
How to design programs
Twitter accounts for all StackOverflow users by reputation and area
One fact per day from computer science, math, statistics, etc.
Science
Elementary mechanics from a mathematician’s viewpoint
Using ultrasound to study dying languages
Math
Spherical trigonometry textbook from 1886, typeset in LaTeX
Real Roman numerals
Ulam spiral


Fascinating links as ever.
The Roman numerals article led me to something I found particularly interesting: the use of IIII on clocks instead of IV to reduce the number of molds required to just one, see http://en.wikipedia.org/wiki/IIII#Calendars_and_clocks
Thanks. I hadn’t heard the practical explanation for IIII on clocks.
I liked the line in the article “There are many suggested explanations for this, several of which may be true.”