What's the Kennection? #195

What tempo marker for stately, dignified music, from the Italian for "broad," is slower than lento or adagio?

Which member of the Guardians of the Galaxy is called "the Destroyer"?

Do toilets flush in the opposite direction in the Southern Hemisphere?

What old European festival is now used to celebrate International Workers' Day, in commemoration of the 1886 Haymarket massacre?

What 1974 Peter Benchley novel begins, "The great fish moved silently through the night water"?

What's the "Kennection"?