Articles on Ruby internals

April 2012 Exploring Ruby’s Regular Expression Algorithm
March 2012 Why You Should Be Excited About Garbage Collection in Ruby 2.0
February 2012 The Joke Is On Us: How Ruby 1.9 Supports the Goto Statement
Is Ruby interpreted or compiled?
Journey to the center of JRuby
January 2012 My first impression of Rubinius internals
Seeing double: how Ruby shares string values
Never create Ruby strings longer than 23 characters