Name The Year: British Empire Day?

Questions

What type of flower is cransbill?

What type of meat usually goes into frankfurters?

What was the full name of the eminent physicist who dipped a piece of o-ring into a glass of water in a demonstration, and proved that low temperatures at the launchpad were responsible for the challenger disaster?

What year did Pascal invent the adding machine?

Which Charles Dickens character said "please sir, i want some more?