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The most astounding fact by Neil deGrasse Tyson.
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So dad, how do you like the iPad we got you?
Look at yourself after watching this.
This guy must be a cyborg.
Dog trying to get a 'stranger' to throw a stick for him.
Tents that turn into concrete in less than 24 hours.
Alpine coaster with no brakes.
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Renowned astrophysicist Neil deGrasse Tyson delves into one specific topic in this fascinating video. Listen in as he discusses what he believes is the single most astounding fact about the universe.