The Kelly Coin-Flipping Game: Exact Solutions. Also worth taking some time to explore the whole site which is beautifully designed.

Lesser Known PostgreSQL Features.

//
// Dear maintainer:
//
// Once you are done trying to 'optimise' this routine,
// and have realized what a terrible mistake that was,
// please increment the following counter as a warning
// to the next guy:
//
// total_hours_wasted_here = 16
//

https://stackoverflow.com/q/184618/420055

How many principal components?.

It is oddly satisfying to know that no matter the kind of machine I find myself on or the kind of restrictions it has (no network to download Emacs and/or my custom configuration, corporate policy against fetching packages from MELPA, etc.), that there will always be an editor that I can happily use without needing to make it “my own”. — vi, my favorite config-less editor

How Python List Works. #python

Preserving k-mer frequencies in sequence shuffles.

Learning Containers From The Bottom Up.

The proper use of macros in Lisp. #lisp

Computing prime numbers with Clojure. #clojure