Q1668Tu Youyou screened hundreds of traditional Chinese remedies for something that would kill the malaria parasite. The answer came from a fourth-century text — and the crucial detail was that the plant had to be soaked cold, not boiled.
Working through the Cultural Revolution with almost no equipment, she and her team tested more than two thousand candidate preparations. Sweet wormwood kept showing promise and then failing. She went back to a Chinese medical text written around AD 340, which described steeping the herb in cold water, and realised heat was destroying the active compound. Extracted cold, artemisinin worked. She tested the first dose on herself. It has since saved millions of lives, and in 2015 she became the first Chinese woman to win a Nobel Prize in science.






