作者介紹 Hamidreza Motifar has been teaching chemistry for 20 years and he has also written 41 books in the same field. He has Master's degree in chemistry and currently passing the PhD course. He teaches chemistry with numorous examples and their usages in life. That is why thousands of students are attending in his classes. Due to Javaneh Pooya Company's request which is known as one of the biggest cinema and educational movie's producers in Iran, he has presented 20 educational CDs about chemistry at pre-university level which are the best-sellers in Iran market. He has also been involved in formulations and making creams and has succeeded in formulating several types of face creams such as anti-wrinkle, eye creams, and etc.