The chemistry must be respected." So says Walter White.
Walt is a brilliant research chemist who has to leave his work and take up a career teaching high school chemistry.
After discovering he has terminal cancer, he turns his skills to methamphetamine production in collaboration with former pupil Jesse Pinkman.

The history of chemistry represents a time span from ancient history to the present. By 1000 BC, civilizations used technologies that would eventually form the basis of the various branches of chemistry. ... However, by performing experiments and recording the results, alchemists set the stage for modern chemistry. In 1869 Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass. He predicted the discovery of other elements, and left spaces open in his periodic table for them. In 1886 French physicist Antoine Bequerel first discovered radioactivity.