The article presents an experiment where a blog post's language changes over time, starting from modern English and going back to Old English, to test how far back in time a reader can understand English. The post's language, spelling, and grammar change with each time period, making it increasingly difficult to comprehend. The author discusses the stability of written English over the last 300 years and how the voice and format of writing have changed faster than the language itself. The article invites readers to reflect on their own ability to understand English from different time periods.