## Other

Under construction - (A selection of random things)

**Interesting books**

- "Information is beautiful"

**Interesting charts**

- FB relationships and betweenness-centrality fb2.pdf

**Interesting programs**

- vowpal wabbit (online machine learning)
- cplex (combinatorial optimization)
- porta (integer polytope analysis)
- tesseract (low level ocr)
- postscript (the postfix-notation programming language)

**Interesting paradoxes**

- Mathematical
**Braess**: How adding an additional road (at a badly selected place) increases capacity, but can make traffic worse (non optimal Nash equilibrium).**Newcomb**: Intuitively correct versus obviously correct: when a problem is (deliberately) ambiguously underspecified.**Simpson**: Treatment A is better than B for group 1, and also separately for group 2, but the inverse is correct for groups 1 and 2 combined. Can made to happen easily by adding imbalance between the two groups for each treatment.**Harmonic mean**: People use the average for situations where the correct way is to use the harmonic mean. The harmonic is the correct way to average km/hour, miles per hour, dollars per kilo, miles per litre (gallon) etc, because in reality, one ought to be averaging (with the arithmetic mean) the hours/km, hours per mile, kilos per dollar, and litres or gallons per mile.**Benford****Friendship**

- Computer science
- A limitation of floating number precision

- NLP related
- Selection of difficult or ambiguous phrases for NLP processing