Elon Musk acted like an ecstatic child as SpaceX's rocket landed for the 1st time

SpaceX founder Elon Musk is not exactly known for being an emotionally expressive guy. 
Musk, when he appears in public, has a pretty laid-back demeanor, but that calm exterior goes out the window in a newly released clip from National Geographic. The nearly four minute video shows Musk watching the first stage of a Falcon 9 rocket land back in Florida. 
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The landing, which happened almost exactly one year a