What is the fine-grained topic of the following text: According to Cambridge University historian David Reynolds, in his 2009 book “Summits: Six Meetings that Shaped the Twentieth Century,” the great British leader employed the word this way in a speech in Edinburgh Scotland in February 1950, probably because of the global media attention focused on efforts by climbers to scale Mount Everest in the Himalayas. Only return the topic.
Winston Churchill's use of the word 'summit' in a 1950 speech, according to David Reynolds' book "Summits: Six Meetings that Shaped the Twentieth Century".