#229 What's the Kennection?

1) Bosnia is now the only nation to use what name for its currency, which Germany, Poland, and Estonia used during the 20th century?
2) In prison, Malcolm X's substitute for marijuana was what eggnog spice, which can deliver a high in large doses?
3) In 2014, Denzel Washington made a film adaptation of what 1980s TV hit, which starred Edward Woodward as the title vigilante?
4) Water polo is one of two summer Olympic sports in which two teams of seven face off. What's the other one?
5) What part of an email includes just two required fields: "From:" and "Date:"?
What's the "Kennection"?
Ken Jennings was on Jeopardy! 75 times in a row, so long that your grandma got sick of him. He is the author of twelve books, most recently Planet Funny: How Comedy Took Over Our Culture. He lives in Seattle.