~ Early Web Links ~

A free, publicly available book series teaching ray tracing and path tracing from scratch, written by a veteran graphics instructor who distills course notes into a practical, code-along guide. Readers build a full path tracer step by step, producing impressive rendered images without relying on any graphics API.

A collection of interactive browser-based puzzles and logic games designed for children, covering math triangles, magic squares, matchstick puzzles, sliding tiles, river crossing challenges, and sorting activities. Hosted by Virtual Teacher Aide, the site offers hands-on drag-and-click gameplay that builds skills in visual discrimination, number recognition, and logical thinking across multiple difficulty levels.

Aceso Under Glass is Elizabeth's curiosity-driven blog that digs into practical knowledge ranging from clothing quality and shopping strategies to statistics, queuing theory, and the history of Bell Labs. The tagline 'What if we understood more things?' captures the spirit of a writer who investigates everyday and technical topics with analytical rigor and genuine enthusiasm.

Ian Fieggen, aka 'Professor Shoelace,' has spent over two decades building the internet's definitive reference on shoelaces, covering more than 100 lacing methods with step-by-step tutorials and thousands of photos. The site is home to the famous Ian Knot, claimed to be the world's fastest shoelace knot, and includes an interactive lacing tool, knot comparisons, and detailed guides on shoelace construction and lengths.

Buthaina Al-Othman, an EFL/ESP instructor at Kuwait University, maintains this professional hub for her English language teaching courses including remedial, scientific, legal, and engineering English. The site features student projects, useful links for language learners, TESOL professional development resources, and archives of her presentations with the Webheads community spanning over a decade.

Chapter Two of 'Eyes on the Sky, Feet on the Ground,' an educational astronomy resource hosted by Harvard, explains the causes of Earth's seasons through clear text and diagrams. It walks students through the tilt of Earth's axis, how it affects hemispheric sunlight, and includes hands-on discussion questions and experiments for deeper learning.

Vincent's Chemistry Page is a study resource aimed at CBSE Plus II students preparing for board exams, offering interactive assignments and syllabus details. It also touches on information about admission to foreign universities, making it a handy academic companion for Indian high school chemistry learners.

Mr. Donn's site offers a large collection of free PowerPoint presentations covering ancient history, American history, world history, mythology, holidays, and geography, all designed for classroom use with kids in grades 5 and 6. Created by Lin Donn and illustrated by Phillip Martin, this educator resource includes presentations on topics ranging from Mesopotamia and ancient Egypt to the Civil War and Buddhism.

Riot Medicine, created by hakan_geijer, provides free downloadable manuals for practicing emergency and field medicine in protest and activist contexts. The site offers public domain guides covering insurrectionary medicine, operational security, and street medic tactics for those who may not have access to traditional medical training.

Sakubi is a free, public domain Japanese grammar guide covering everything from absolute beginner concepts like particles and verb conjugations to more advanced structures, organized into clearly numbered lessons. Released into the public domain and written with a conversational tone, it remains a beloved reference in online Japanese learning communities despite being archived since late 2017.