aircraft crashes 2 [vynechat] astronomers 2 [vynechat] astronómovia 2 [vynechat] diplomati 2 [vynechat] diplomats 2 [vynechat] letecké nehody 2 [vynechat] politici 2 [vynechat] politicians 2 [vynechat] computers 1 [vynechat] dejiny matematiky 1 [vynechat] dejiny objavov a vynálezov 1 [vynechat] history of discoveries and inventions 1 [vynechat] history of mathematics 1 [vynechat] opera 1 [vynechat] počítače 1 [vynechat] radio engineering 1 [vynechat] rádiotechnika 1 [vynechat] television 1 [vynechat] televízia 1 [vynechat]