THE BODY: What name is given to the bodys 24 hour cycle of sleeping, waking?

Questions

History - Between which countries was the shortest war in history?

History - Bill and Hilary Clinton switched on the Christmas tree lights in Belfast, Northern Ireland, in 1990, 1995 or 1996?

History - By who was Gerald Ford almost assassinated?

History - Did Rotheim invent the aerosol in 1919, 1926 or 1931?

History - East Berlin was the capital of ?