Video Description: Jeff Havlik, a roller coaster architect, answers the question. To learn more about Jeff and the work he does, view a video about him here.
**The unique Video ID can be used to quickly locate a single video in the ET collection. This search function is designed to let teachers assign students to watch a specific video and have only that video appear as a search result. Just click on Search and choose “By Video ID.” Then type in the Video ID as it appears above. Be sure to include the dash.