How Much Does a Shadow Weigh?

Veritasium SLINKY video: http://bit.ly/SGD73o Veritasium channel... SUBSCRIBE: http://bit.ly/RoMMH7 A great Veritasium episode about using video to teach: http://bit.ly/VOsZVx Vsauce2 LEANBACK about shadows: http://bit.ly/VOt8rP Vsauce3 explains how realistic SimCity is... SUBSCRIBE: http://bit.ly/PMThlp ALL MUSIC BY: http://www.soundcloud.com/JakeChudnow Jake's YouTube channel: https://www.youtube.com/jakechudnow Vsauce on Twitter (lots of extra mindblows): http://www.Twitter.com/TweetSauce Vsauce on Facebook (your chance to blow MY MIND): http://www.Facebook.com/VsauceGaming Hand shadow book: http://books.google.co.uk/books/about/Fun_with_Hand_Shadows.html?id=UhjBUYIUmO0C&redir_esc=y Light "pushes" us: http://www.straightdope.com/columns/read/2987/do-shadows-weigh-anything Solar Sail: http://www.jspec.jaxa.jp/e/activity/ikaros.html solar sail GIF: http://www.jspec.jaxa.jp/e/activity/images/ikaros/pic_10.gif Venutian Shadows: http://www.digitalsky.org.uk/venus/shadow-of-venus.html Speed of light in different materials: http://cadlab6.mit.edu/2.009.wiki/anchor/index.php?title=Speed_of_light_in_vacuum%2C_air%2C_glass sonic boom demonstration: http://demonstrations.wolfram.com/WavesFromAMovingSource/ Cherenkov radiation: http://profmattstrassler.com/articles-and-posts/particle-physics-basics/cerenkov-radiation/ and: http://en.wikipedia.org/wiki/Cherenkov_radiation Photonic booms in your eyes: http://en.wikipedia.org/wiki/Cosmic_ray_visual_phenomena Pushing a lightyear-long object: http://www.physicsforums.com/showthread.php?t=386687 compression / longitudinal waves: http://en.wikipedia.org/wiki/Longitudinal_waves cool site for putting things in perspective (this link is for 1 sq. inch): http://www.bluebulbprojects.com/measureofthings/doShowResults.asp?comp=area&unit=in2&amt=1&sort=pr&p=1 Also this is important: http://animalsbeingdicks.com/post/23101742089/clean-get-away