A Greyhound cocktail is vodka and which tart juice?

Which Greek letter serves as the title of Darren Aronofsky's 1998 film about an eccentric math whiz? Which "green" government agency is abbreviated EPA? A greenbottle is which type of insect? A greengage is a plum; a greening is what fruit? A group of rebels in Texas confronted by Mexican forces retreated into which stronghold on February 23, 1836? What is a group of cavalry, such as Troop A, B or F, called? Which word names a group of kangaroos or of Girl Scouts? What is a group of new rulers who take power after a coup called?