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    Video thumbnail: WGBH 2016 Boston Marathon, Mile 1: The Great Unknown

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    2016 Boston Marathon, Mile 1: The Great Unknown

    The marathon will always surprise you: There’s just so much that can happen in 26.2 miles.

    2016 Boston Marathon, Mile 1: The Great Unknown

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 2: Why Bother?

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    2016 Boston Marathon, Mile 2: Why Bother?

    After all, it’s a lot easier to just sit on the couch.

    2016 Boston Marathon, Mile 2: Why Bother?

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 3: A Tour Of The Course

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    2016 Boston Marathon, Mile 3: A Tour Of The Course

    Archival footage from 1979, in which Bud Collins narrates a tour of the course.

    2016 Boston Marathon, Mile 3: A Tour Of The Course

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 4: Running Before It Was Cool

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    2016 Boston Marathon, Mile 4: Running Before It Was Cool

    Running wasn't always popular: We talk to the people who did it before it was cool.

    2016 Boston Marathon, Mile 4: Running Before It Was Cool

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 5: The Story Of Bobbi Gibb

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    2016 Boston Marathon, Mile 5: The Story Of Bobbi Gibb

    Last year, 45 percent of Boston Marathon runners were women. 50 years ago, there was one.

    2016 Boston Marathon, Mile 5: The Story Of Bobbi Gibb

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 6: ?The Best Marathon

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    2016 Boston Marathon, Mile 6: ?The Best Marathon

    There’s something special about the Boston Marathon.

    2016 Boston Marathon, Mile 6: ?The Best Marathon

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 8: Johnny Kelley

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    2016 Boston Marathon, Mile 8: Johnny Kelley

    Archival footage from 1979, in which Bud Collins interviews John A. Kelley.

    2016 Boston Marathon, Mile 8: Johnny Kelley

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 9: 80° With A Chance Of Snow

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    2016 Boston Marathon, Mile 9: 80° With A Chance Of Snow

    Runners talk about training through winter and the fickle nature of spring.

    2016 Boston Marathon, Mile 9: 80° With A Chance Of Snow

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 10: K. Switzer Meets Her Nemesis

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    2016 Boston Marathon, Mile 10: K. Switzer Meets Her Nemesis

    Kathrine Switzer interviews her one-time nemesis, race official Jock Semple.

    2016 Boston Marathon, Mile 10: K. Switzer Meets Her Nemesis

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 11: Running With The Best

    WGBH

    2016 Boston Marathon, Mile 11: Running With The Best

    At Boston, everyday runners cross the same finish line as the best runners in the world.

    2016 Boston Marathon, Mile 11: Running With The Best

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 12: The Story of Rosie Ruiz

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    2016 Boston Marathon, Mile 12: The Story of Rosie Ruiz

    A skeptical Kathrine Switzer interviews Rosie Ruiz in this archival footage.

    2016 Boston Marathon, Mile 12: The Story of Rosie Ruiz

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 13: Hit The Road, Jack

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    2016 Boston Marathon, Mile 13: Hit The Road, Jack

    Lace up your sneakers and hit the town, Boston­-style.

    2016 Boston Marathon, Mile 13: Hit The Road, Jack

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 16: Pace Yourself

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    2016 Boston Marathon, Mile 16: Pace Yourself

    An animated exploration of pace at the Boston Marathon.

    2016 Boston Marathon, Mile 16: Pace Yourself

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 15: Kenya Keep Up?

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    2016 Boston Marathon, Mile 15: Kenya Keep Up?

    For the last two decades, marathon running has been dominated by athletes from Kenya. Why?

    2016 Boston Marathon, Mile 15: Kenya Keep Up?

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 17: It Was Almost Indescribable

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    2016 Boston Marathon, Mile 17: It Was Almost Indescribable

    Juan Carlos Gonzalez was yards away from the finish line in 2013 when he saw smoke.

    2016 Boston Marathon, Mile 17: It Was Almost Indescribable

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 18: Before and After

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    2016 Boston Marathon, Mile 18: Before and After

    After the bombs went off near the finish line in 2013, the marathon changed.

    2016 Boston Marathon, Mile 18: Before and After

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 19: Running For Those Who Can’t

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    2016 Boston Marathon, Mile 19: Running For Those Who Can’t

    Many athletes are running the Boston Marathon for someone who can't.

    2016 Boston Marathon, Mile 19: Running For Those Who Can’t

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 21: Can't Stop, Won't Stop

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    2016 Boston Marathon, Mile 21: Can't Stop, Won't Stop

    After all that hard work, marathoners will push through anything.

    2016 Boston Marathon, Mile 21: Can't Stop, Won't Stop

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 22: A Little Help From My Friends

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    2016 Boston Marathon, Mile 22: A Little Help From My Friends

    If you think running is a solitary sport, think again.

    2016 Boston Marathon, Mile 22: A Little Help From My Friends

    Video thumbnail: WGBH 2016 Boston Marathon, Mile 23: Love on the Run

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    2016 Boston Marathon, Mile 23: Love on the Run

    The Boston running community is full of very cute couples who met because of it.

    2016 Boston Marathon, Mile 23: Love on the Run