Chemistry: The process of removing salt from sea water is known as ________.?

Questions

What title did Zola give to the letter he wrote to the newspaper L'Aurore in 1898?

Which former drama critic of the Observer devised the revue "Oh Calcutta"?

In which town or city in the north-west is the Rylands Library?

Who was beaten at the battle of Actium by Octavian?

Which hard substance, closely resembling bone, makes up the bulk of a tooth?