Introduction Computation The Limits of Computation Algorithms A Laboratory for Computational Experiments. The Ruby Workbench Introducing Ruby and the RubyLabs environment for computational experiments Interactive Ruby Numbers Variables Methods RubyLabs The Sieve of Eratosthenes. An algorithm for finding prime numbers. The Sieve Algorithm The mod Operator Containers Iterators Boolean Values and the delete if Method Exploring the Algorithm The sieve Method A Better Sieve Experiments with the Sieve A Journey of a Thousand MilesIteration as a strategy for solving computational problems Searching and Sortin.