The largest physics lesson involved 5,401 participants who were taught by Steve Spangler Science (USA) during a presentation at Coors Field in Denver, Colorado, USA, on 7 May 2009. The event was part of the 9News Weather & Science Day hosted by Steve Spangler and Kathy Sabine. Guinness World Records™ Adjudicator, Danny Girton, was present at the event to award the new record.