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CrashCourse · 发布于 2014年4月14日
In which Hank has to say things... and it's not easy! Want more videos about psychology? Check out our sister channel SciShow Psych at https://www.youtube.com/scishowpsych -- Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Instagram - https://www.instagram.com/thecrashcourse/ CC Kids: http://www.youtube.com/crashcoursekids
