The most amazing videos of the week

Top moments from David Letterman finale
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    Top moments from David Letterman finale

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Top moments from David Letterman finale 01:54

Story highlights

  • What's the deal with the X-37B?
  • An Army captain saves people from fiery accident and other videos

(CNN)A rhino in the sights. A barista in a snit. And a legend in his element.

These are the best videos of the week.

1. #ThanksDave

    Remember David Letterman? Back in the distant past of Wednesday, he was a talk show host. His finale was full of moments both touching and hilarious, and we've gathered a few to remember him by.
    Watch the video at the top of this story.

    2. Killing a rhino

    Hunter Corey Knowlton traveled to Namibia to track and kill an endangered black rhino. CNN's Ed Lavandera went with him to get the details.
    Watch the video:
    The journey to kill a black rhino
    The journey to kill a black rhino

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      The journey to kill a black rhino

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    The journey to kill a black rhino 03:07

    3. X-37B

    It doesn't have a crew. It's been called the "mystery space plane." Just what is this vehicle exploring?
    Watch the video:
    Mysterious space plane returns to orbit
    secret mystery space plane orbit airforce nasa orig_00011802

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      Mysterious space plane returns to orbit

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    Mysterious space plane returns to orbit 01:47

    4. A fatal BASE jump

    Dean Potter, a legendary extreme athlete, died while apparently attempting a jump from a Yosemite peak in a wingsuit.
    Watch the video:
    Extreme sports legend and friend killed in BASE jump
    Extreme sports legend and friend killed in BASE jump

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      Extreme sports legend and friend killed in BASE jump

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    Extreme sports legend and friend killed in BASE jump 01:02

    5. A real Captain America

    A fiery car crash? It's Captain America to the rescue -- or at least Army Capt. Steve Voglezon, who saved people from a horrific accident while wearing a Captain America T-shirt.
    Watch the video:
    Army captain makes daring rescue
    ac intv hero army captain steve voglezon_00003208

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      Army captain makes daring rescue

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    Army captain makes daring rescue 03:00

    6. Riding with danger

    Motorcycle gangs aren't some relic of the "Wild One" 1950s or the "Wild Angels" 1960s. They still exist today, and the Department of Justice classifies some of them as conduits for criminal enterprises.
    Watch the video:
    The most dangerous biker gangs in the U.S.
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      The most dangerous biker gangs in the U.S.

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    The most dangerous biker gangs in the U.S. 01:48

    7. Would like some fury with that latte?

    A Starbucks employee started yelling at a customer during a transaction. This did not go over well.
    Watch the video:
    Starbucks employee loses job after berating customer
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      Starbucks employee loses job after berating customer

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    Starbucks employee loses job after berating customer 01:31

    8. Michelle's moves

    Michelle Obama doesn't just talk about good fitness; she lives it. See if you can keep up.
    Watch the video:
    Check out Michelle Obama's intense fitness routine
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      Check out Michelle Obama's intense fitness routine

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    Check out Michelle Obama's intense fitness routine 01:05