Lithium hydride
Before the Castle Bravo nuclear weapons test in 1954, it was thought that only the less common isotope lithium-6 would breed tritium when struck with fast neutrons. The Castle Bravo test showed (accidentally) that the more plentiful lithium-7 also does so under extreme conditions, albeit by an endothermic reaction.
Castle Mountain
The first climber to reach the top of Castle Mountain was Arthur P. Coleman, a professor at the University of Toronto, in 1884. Lawrence Grassi and P. Cerutti, both from Canmore, were the first to climb Eisenhower Tower in 1926.