Ten members of which secret society of Irish immigrant coal miners were hanged in Pennsylvania on June 21, 1877?

What does it mean when a baseball pitcher is called a "southpaw"? Which word describes a difficult, bad-tempered, cantankerous person? Which 10-letter word means the owner of a hotel or other business? Which 10-letter word means impervious to sound? In carpentry, 10-penny, 16-penny and 20-penny are sizes of what? Which Olympic event consists of 10 track and field events held over two days? Which company's name is a play on "googol", the number 10 to the 100th power? What does 10 to the zero power equal?