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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:   / jakechudnow   Jake's YouTube channel:    / jakechudnow   Vsauce on Twitter (lots of extra mindblows):   / tweetsauce   Vsauce on Facebook (your chance to blow MY MIND):   / vsaucegaming   Hand shadow book: http://books.google.co.uk/books/about... Light "pushes" us: http://www.straightdope.com/columns/r... Solar Sail: http://www.jspec.jaxa.jp/e/activity/i... solar sail GIF: http://www.jspec.jaxa.jp/e/activity/i... Venutian Shadows: http://www.digitalsky.org.uk/venus/sh... Speed of light in different materials: http://cadlab6.mit.edu/2.009.wiki/anc... sonic boom demonstration: http://demonstrations.wolfram.com/Wav... Cherenkov radiation: http://profmattstrassler.com/articles... and: http://en.wikipedia.org/wiki/Cherenko... Photonic booms in your eyes: http://en.wikipedia.org/wiki/Cosmic_r... Pushing a lightyear-long object: http://www.physicsforums.com/showthre... compression / longitudinal waves: http://en.wikipedia.org/wiki/Longitud... cool site for putting things in perspective (this link is for 1 sq. inch): http://www.bluebulbprojects.com/measu... Also this is important: http://animalsbeingdicks.com/post/231...