Teenager Builds Backyard Roller Coaster...
[http://youtu.be/RzZFrcxY208] (YouTube link)David Chesney started building a wooden roller coaster in his backyard in Toronto when he was only 15. Now that he’s 19 and a Queen's University engineering student, The...
https://www.neatorama.com/2014/08/01/Teenager-Builds-Backyard-Roller-Coaster/
