#208 What's the Kennection?

1) What battle, fought 25 miles east of Athens in 490 BC, kept the Persians out of Greece for ten years?
2) What Chicago rapper won an Oscar in 2015 for the song "Glory," which he recorded with John Legend for the Selma soundtrack?
3) What elderly nickname has been the title of biographies of both Louis Armstrong and baseball legend Willie Stargell?
4) What medieval term for brown bears did UCLA adopt as its new team name, replacing "Grizzlies," in 1926?
5) By 2011, what grassroots political movement had 60 members in its Congressional caucus, founded by Michele Bachmann?
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 nine books, most recently the Junior Genius Guides for children. He lives in Seattle.