The document discusses several topics:
1. It describes early mentions of "tip of the tongue" experiences in literature from 1885 and psychology literature from 1890. Harvard psychologists later conducted the first empirical study of the phenomenon.
2. It discusses Jimmy Wales' motivation for starting Wikipedia after his daughter received an experimental medical treatment that saved her life from a rare lung condition.
3. It identifies Cuba and Fidel Castro as playing a key role in revolutionary successes in Algeria and Angola, and defeating apartheid in South Africa through their support of MPLA and combined forces with Angola defeating the South African army.