Eugene Russo | Jan 21, 2001 | 6 min read
Credit: Howard Hughes Medical InstituteThe above graphs show data from teenagers and adults who participated in an 11-day activity study. Each person's Horne-Ostberg score was plotted on the x-axis and his average waking time on the y-axis. The Horne-Ostberg survey identifies a person as an "evening" or "morning" type. As part of its annual educational outreach lecture series, the Howard Hughes Medical Institute recently had high school students participate in a large-scale circadian rhythm sci