Part of a growing community of "fusioneers" - amateur science junkies who are building homemade fusion reactors, for fun and with an eye to being part of the solution to that problem.
He is the 38th independent amateur physicist in the world to achieve nuclear fusion from a homemade reactor, according to community site Fusor.net. Others on the list include a 15-year-old from Michigan and a doctoral student in Ohio.
"I won't say something that puts these guys down, but it's a tricky situation because there is a great deal of money and time and a lot of very experienced scientists working on fusion at the moment," said Mr Calder.
"But that does not eliminate other ideas coming from a different group of people." Read full at BBC News
"But that does not eliminate other ideas coming from a different group of people." Read full at BBC News