The other day I saw a television story on the top Aussie icons. Things like Vegemite, lamingtons, meat pies, Holden utes and Hills Hoist clotheslines were on the list. With the Olympics coming up, I started thinking about some Aussie inventions that have assisted our sports people. In 1874, Melbourne watchmaker and mechanical engineer, Louis Brennan, aged just 22, invented the underwater torpedo. (Obviously a future omen for Ian “Thorpedo” Thorpe). Travelling to the Olympics requires a plane.