Page 159. " why should we have to put on the Ritz for the Underdowns? "

This comes from a popular song, Puttin' on the Ritz, written by Irving Berlin in 1929.  The phrase means to dress nicely for company or a certain occasion, and derives from London's elegant Ritz Hotel.

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Page 161. " It said Khrushchev wanted to take over the Belgian Congo "

Khrushchev and JF Kennedy
Public DomainKhrushchev and JF Kennedy - Credit: U. S. Department of State
Nikita Krushchev was Premier of the Soviet Union from 1958 to 1964. 

At the time, the West feared the Soviet Union might influence the large and resource-rich Congo to become Communist and a threat to the USA.

Page 161. " Bingo, Bango, Bongo I don't want to leave the Congo! "

"Civilization" was a song written by Bob Hilliard and Carl Sigman for the 1947 Broadway musical, Angel in the Wings. It was performed by Elaine Stritch.

The song is a satire sung from the perspective of a native "savage" whose village has recently been settled by a missionary trying to make the tribe "civilized". However the savage thinks differently, noting the major flaws in civilized society and ultimately deciding to stay where he is.  

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Page 173. " The last shall be first "

This is a reference to the parable of the Workers in the Vineyard, found in Matthew 20:1-16.

So the last shall be first, and the first last: for many be called, but few chosen

It is the story of a vineyard owner who hires different groups of casual labourers for different lengths of time. At the end of the day, the landowner pays them all equally, starting payments with the last person to get there. It's a story of equality and generosity, but also of entitlement because the ones who had been there longer thought they were entitled to more.