Nobel prize winner Jeffrey C. Hall speaks with a visitor at his home in Cambridge, Maine, Monday, Oct. 2, 2017. Hall, along with Michael Rosbash and Michael W. Young, won the 9-million-kronor ($1.1 million) prize for their work on finding genetic mechanisms behind circadian rhythms, which adapt the workings of the body to different phases of the day, influencing sleep, behavior, hormone levels, body temperature and metabolism. (AP Photo/Robert F. Bukaty)