Which is the name for a festival of Scottish Gaelic song, arts and culture which largely takes the form of formal competitions in choral events, traditional music and spoken word?
What is a present term for the 15th and 16th century transfer of plants, food crops, animals, culture, people, technology, diseases, and ideas between the "New World" of the Americas and the "Old World"?
What is the art and science of writing hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the message?
