tv: This product goes "plop plop fizz fizz"?

Questions

History - Which Apollo space mission put the first men on the moon ?

History - Which Baltic seaport was the German rocket centre during WWII?

History - Which Spanish explorer first travelled to Jamaica?

History - Which US president said 'the buck stops here'?

History - Which british comedian was the first man to appear on the cover of 'playboy'?