A Lego in space.
Two teenagers from Toronto sent a Lego man carrying a Canadian flag into the stratosphere. Mathew Ho and Asad Muhammad, both 17, attached four cameras to a balloon carrying the toy astronaut 24km above Earth. A week after launch they recovered their Lego man in a field, and discovered they had captured stunning space footage
Following this wonderful video, Guardian Comment asks its readers what their most memorable childhood video was.