Codex Sinaiticus is one of the oldest, famous, and most important manuscripts of the Bible. At least three scribes copied the text manually, and they were faced with many decisions: What do I do when I spot an error in the text I just copied? What is the right spelling of this word? Is it time for a new paragraph? This book studies a variety of textual and non-textual phenomena in Codex Sinaiticus. We discover more about this important biblical manuscript as well as the individuals with their own habits, qualities, and skill levels who produced it.