Misc: What board game is called checkers in North America?

Questions

History - His wife was Roxana, his horse was Bacephalus, he was?

History - How many British officers were forced by Indian troops into the Black Hole of Calcutta?

History - How many people were killed in the battle of Lexington?

History - How many years was Nelson Mandela in prison?

History - In 1962, for what did Britain and France sign an agreement to build together?