Misc: City, capital of Nepal, in the central part of the country?

Questions

What does the French word Hourderve translate to in English?

What is the most nutritious food in the world?

What new gadget was Mark Twain referring to when he was quoted as saying ‘a curiosity-breeding little joker’?

What are the hole punchings on a postage stamp called?

What is the technical name for the extra wedge of fruit found in Navel oranges, Grapefruits, Temple Oranges & tangelos?