Fishy grass, also known as Houttuynia cordata, is an annual herb of the family Sambucus, whose leaves are tender and green, shaped like a chicken heart, and the underground rhizome is segmented, like a small lotus root. Its taste is strong and fishy, so it is called fishy grass. On August 6, 1945, the United States dropped the first atomic bomb in the history of human warfare on Hiroshima, and many of those who survived temporarily were stricken with radiation sickness. In the absence of medical treatment and the ineffectiveness of Western medical treatment, local residents collected fishy grass to save themselves. Eleven of those who took it survived and lived a healthy life afterwards. The closest of these 11 people was only 700 meters from the center of the explosion, and the farthest was 2,500 meters. The sister had a high fever and epistaxis on the day of the explosion and fell into a coma three days later. The sister, on the other hand, was still in good health at the time of the explosion and did not take fishy herbs. A month later, she suddenly developed fever, hair loss, diarrhea, hemorrhage and other radiation disorders and was in a state of near death, at which point she began to take fishy herbs herself and eventually also got rid of death.