Former NASA engineer Tom Graves, who worked on Apollo and space shuttle missions, is a substitute teacher at Legend High School in Douglas County, Colorado. Read more: https://www.9news.com/article/news/education/nasa-engineer-substitute-teacher/73-5f8e2577-626c-4d4e-8a2b-42fb82b9e15b More local videos here: https://youtube.com/@9news Subscribe to NEXT: https://youtube.com/@Nexton9NEWS Stay connected: 9NEWS Website: https://www.9news.com/ Facebook: https://www.facebook.com/ilike9news Twitter: https://twitter.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.