Misc: What's the cubed root of 27?

Questions

What city was beseiged for 880 days during World War II?

How many British prime ministers have been assassinated?

What race of people suffered an estimated 35 million deaths at the hands of the Mongols?

What weapon did the crossed slits in English castles accommodate?

What theory did John T Scopes teach, contrary to Tennessee law in 1925?