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 of Castelo Branco
In 1981, structures that belonged to the GNR, and which were addorsed to the walls along the "Rua Vaz Preto" were demolished. During the course of the demolition of houses along "Rua Vaz Preto", part of the original wall and towers were re-discovered. This led to the 5 June 2009 proposal to seek a formal classification of the site's heritage status. On 26 October 2009, the DRCCentro requested the castle's classification as a "Property of Public Interest". It was accepted on 28 October by the consultative council of IGESPAR, but the process was archived on 7 January 2013, and the site never obtained its classification.