After 102 years special relativity did not really made it in the current teaching practice. The maximum is a brief talk about the subject, completely disconnected from the current Newtonian mechanics, confirming the idea that it is something strange, difficult, and not useful in practice.

For what general relativity is concerned, very few instructors briefly talk about the equivalence principle.

The cultural relevance of both special and general relativity, and their connection with very simple and general symmetries, is totally neglected.

On the contrary, it is possible to introduce galileian and special relativities at the very beginning of any introductory course, by using extremely simple mathematics and geometry.

Our book, besides being useful for students in engineering, chemistry, mathematics, and physics, teaches the instructors how to change their courses.

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