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Learn Enough Ruby to Be Dangerous teaches you to write practical and modern programs in Ruby, a powerful object-oriented programming language especially common in web development. Learn interactive Ruby, shell scripting, and beginning web development—useful standalone skills that are also the perfect preparation for the Ruby on Rails Tutorial
I’m also the founder of Tau Day and author of The Tau Manifesto, which argues that the true circle constant is the ratio of a circle’s circumference to its radius, not to its diameter. Conceived principally as a social hack, Tau Day and the number
τ=C/r have become an international phenomenon, striking a chord (sometimes literally) with math geeks all over the world, while inspiring a Vi Hart video, subverting the traditional circle constant at the Khan Academy, and even influencing the timing of MIT admissions announcements.