Youtube activity of "Luis Sierra" (@LuisSierra42) on "National Geographic" channel.
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Comments by video
"Breathtaking Look at the Man Who Climbed Everest 21 Times | Short Film Showcase"
"Cancer 101 | National Geographic"
"Earth 101 | National Geographic"
"Genetics 101 | National Geographic"
"Genius - Extended Trailer | National Geographic"
"Samurai Sword - Linked | Explorer"
"Soar Over the Chocolate Hills in the Philippines | National Geographic"
"The Global Spermageddon | Explorer"
"The Story Behind Europe's Tallest Statue: The Motherland Calls | National Geographic"
"The Unique Wildlife of The Scottish Highlands | Short Film Showcase"
"Uranus 101 | National Geographic"