 Hello, this is the History Hour with Max Pearson, this week's compilation of witness history episodes on the BBC World Service. As ever, we have some startling insights for you, including the German-speaking Czech citizens expelled from their own country after the Second World War, the son of a Guatemalan president overthrown in a CIA-backed coup in the 1950s, the founder of the assisted dying organisation Dignitas, and the artist behind the multi-billion dollar Hello Kitty franchise.