Wild Card: What does the hopeful Latin phrase "pacem in terris" mean?

Questions

In which group of islands in Britain were the Churchill Barriers constructed during wwii to ptrotect the British fleet anchored there?

Which cartoonist created George and Gaye Gambol who appeared in the Daily Express from 1951 to 1994?

Which pair of 19th century showmen ran The Greatest Show on Earth?

Who was the narrator for the 1999 BBC1 series of Walking with Dinosaurs?

Who was the first Prime Minister of the Australian Commonwealth from 1901 to 1903?