1983: What was described by Gerald Kaufman as the longest suicide note in history?

Questions

Copenhagen is the capital of ______?

Copernicus what is new, last or gibbous?

Cord what colour is the umbilical cord?

Cornflakes was invented in 1863, 1890 or 1915?

Country in East Asia, the world's third largest country by area (after Russia and Canada) and the largest by population?