Related Clues:

• 10K, for example
• Streak
• Opposite ___
• Political activity
• Leading cause of birth
• 10K or marathon
• Beat quickly, as a heart
• Kinsey subject
• Alfred Kinsey research topic
• Career
• See 24 Down
• Boston Marathon, e.g.
• ___ Ed
• Indy 500, for example
• It takes two, usually, at least