The creator of the C++ programming language brings us a new textbook in programming principles that could well become a classic tome.
Most of us just use FOSS, but somebody has to develop and write the code. And the language that's used greatly affects the outcome. If you haven't tried Ruby yet, you owe it to yourself to begin playing with it. If you value joy, if you value simplicity, if you value beauty, then you owe it to yourself to learn Ruby, the emerging jewel of FOSS.