useless trivia: What Word Means: A Body Cavity In Some Animals?

Questions

What is measured in oktas?

What was the name given to the legendary greek herald who could shout as loudly as 50 ordinary men, his name gave rise to a word meaning loud voiced?

Which dutch physicist invented the first pendulum clock in 1657?

What is also known as a pillbug (they were once used for medicinal purposes and swallowed like pills - yuk!!!)?

What is the common name for the disease parotitis?