What Is The Speed of Dark?

Support Vsauce, your brain, Alzheimer's research, and other YouTube educators by joining THE CURIOSITY BOX: a seasonal delivery of viral science toys made by Vsauce! A portion of all proceeds goes to Alzheimer's research and our Inquisitive Fellowship, a program that gives money and resources directly to growing science channels here on YouTube! https://www.curiositybox.com twitter:   / tweetsauce   instagram:   / electricpants   facebook:   / vsaucegaming   SOURCES BELOW: this is the video where I talk about THE SPEED OF PUSH:    • How Much Does a Shadow Weigh?   Big thanks to Martin Archer for help with this episode: http://www.martinarcher.co.uk/ And thanks to Guy Larsen for his shadow magic:   / guylar   music by    / jakechudnow   and http://www.audionetwork.com shadows faster than light: http://math.ucr.edu/home/baez/physics... http://physics.stackexchange.com/ques... http://www.madsci.org/posts/archives/... making the moon brighter: http://what-if.xkcd.com/13/ sunset and earth’s shadow and belt of venus in single pics: http://apod.nasa.gov/apod/ap131024.html http://apod.nasa.gov/apod/ap100729.html amounts of evening-types in a city: http://weatherspark.com/averages/3312... superluminal scissors: http://math.ucr.edu/home/baez/physics... http://boards.straightdope.com/sdmb/a... wave animations: http://www.ablongman.com/mullin/Anima... http://www.acs.psu.edu/drussell/Demos... http://resource.isvr.soton.ac.uk/spcg... phase velocity vs. group velocity: http://resource.isvr.soton.ac.uk/spcg... faster than light dark patches: http://www.askamathematician.com/2013... http://www.physicsclassroom.com/class... make a light interference pattern at home: http://www.exploratorium.edu/snacks/d... http://www.instructables.com/id/How-t... the speed of ignorance: http://www.brainpickings.org/index.ph... http://philosophicalfallibilism.blogs... http://kk.org/thetechnium/2008/10/the... http://louisecharente.wordpress.com/2... Dunning-Kruger: http://www.huffingtonpost.com/david-m... http://en.wikipedia.org/wiki/McArthur... “animalcules”: http://www.leben.us/index.php/compone...