Navy SEAL Astronauts - Smarter Every Day 243

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I explore the world using science. That's pretty much all there is to it. Watch 2 videos. If you learn something AWESOME, please subscribe if you feel like I earned it. Contact: http://www.smartereveryday.com/contact. I currently get lots of correspondence so please forgive me if I'm unable to reply. I mean well, but want to focus on being a better Dad.