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 Grande
McDougal then loaned his old friend and political mentor, Senator William Fulbright, $700,000 to buy out the bulk of Ward's remaining holdings. The net effect was to remove Ward's non-recourse loan from the Madison books and generate substantial sales profits and commissions for Madison. The transactions were designed to be confusing to keep the regulators from finding Ward's loan and Madison's full investment in Castle Grande. The federal thrift examiners arrived the first week of March, 1986. The Dean Paul loan done on February 28.