1. Ask the Delphic Oracle :
http://www.stanford.edu/~anandem/PuzzleColumnBook/Column1/AskTheDelphicOracle.pdf
2. Inequality of the Means :
http://www.stanford.edu/~anandem/PuzzleColumnBook/Column2/INEQUALITY_OF_THE_MEANS-FINAL.pdf
3. Pizza and Panini :
http://www.stanford.edu/~anandem/PuzzleColumnBook/Column3/PizzaAndPanini.pdf