Buzz·Posted on Apr 22, 2013LeVar Burton And Bill Nye Team Up For The Greatest Peace-Sign/Karate-Chop Combo Sign-Off In The History Of White House Science FairsThis is everything you think it is.by Dorsey ShawBuzzFeed StaffLinkFacebookPinterestTwitterMail Tap to play GIF Tap to play GIF Watch Live: 2013 White House Science Fair whitehouse.gov