Thing Explainer is a book by Randall Munroe that explains complex concepts using simple language and illustrations. The book employs only the 1,000 most common English words to describe various topics, making it accessible to a wide audience. Each explanation is accompanied by detailed drawings that help clarify the ideas being presented. Topics range from black holes to the internet, showcasing how intricate subjects can be understood through straightforward language and visuals. This approach encourages readers to think critically and appreciate the simplicity behind complex ideas.