**Computing**

The wonderful world of early computing

How to design programs

**Twitter**

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.”