Euclid's "Elements"
In the early 1700s, Jean-Baptiste Clairaut taught his kids to read using Euclid's Elements. He had two children who read their first papers to the Paris Academy of Sciences by the age of 13. In my opinion, a modern version of Euclid's Elements should be standard in every elementary school in Canada.
In the 21st century, there are still parents who teach their kids to read using the bible.
