A group of leading scientists this Thursday called for “a genuine investigation” into the origin of the covid pandemic and has defended that “both the theory of an accidental escape from a laboratory and that of a natural jump from the animals". Among the 18 signatories are some of the researchers who have led the study of the new coronavirus, such as the immunologist Akiko Iwasaki, from Yale University (USA); the microbiologist David Relman, from Stanford University (USA); and the epidemiologist Marc Lipsich, from Harvard University (USA). Your letter is published in the magazine Science, showcase of the best international science.