The science of toxicology usually involves the study of poison, venom, acids, and other harmful substances. Students may be able to learn general biological and chemical principles while discovering how exposure to toxins can be prevented and treated.

Mexico, officially the United Mexican States, is a federal constitutional republic in North America. Working may require a work visa, which is difficult to get if you want to freelance for a short time. Most of the government-funded universities in major cities (state capital) have short courses on history, gastronomy, and cultural subjects, and most of them are almost free.