Li Shizhen was a famous medical scientist in Ming Dynasty . He was born in 1518 . He wrote a famous book “Ben Cao Gang Mu” , which is a collection of Chinese herbs . It included 2000 Chinese herbs with millions of characters . He visited mountains , called on ordinary people , tasted different kinds of herbs and even did experiments on himself . It took him 37 years to finish the book . The book is considered to be a great contribution to the development of Chinese medicine .
