useless trivia: What Word Means: A Heavy Javelin?

Questions

what substance is realeased during an allergic reaction?

An oath describing the responsibilities of a physician is known as the________ ____?

The word hysterical may be offensive to feminists, as its root is the latin 'hystera', which means _______?

Aurora borealis are more commonly referred to as what?

What single desert contains half the desert surface of the world?