Rubik's Cube: Why are some cases impossible to solve?

A full explanation on parity, and why it happens on the void cube and 4x4 and not 3x3!

Cube ► GAN 356 XS: https://speedcubeshop.com/products/gan-356-xs-magnetic-3x3

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Beginner:
2x2 Tutorial ► https://youtu.be/GANnG5a19kg
3x3 Tutorial ► https://www.youtube.com/watch?v=7Ron6MN45LY
4x4 Tutorial ► https://www.youtube.com/watch?v=KWOZHbDdOeo
5x5 Tutorial ► https://www.youtube.com/watch?v=d1I-jJlVwB4

Special Tutorials:
3x3 One Handed ► https://www.youtube.com/watch?v=mUF3aPDTO-4
3x3 Blindfolded ► https://www.youtube.com/watch?v=A64Sy4WKiWY

Advanced Tutorials:
2x2 ► https://www.youtube.com/playlist?list=PLI24ciRbl8BX6l1lmnY2wpWOpgRXRkE3w
3x3 ► https://www.youtube.com/playlist?list=PLI24ciRbl8BUHEeOBaLXY4GpaVXSULYp4
4x4 ► https://www.youtube.com/playlist?list=PLI24ciRbl8BXS–dBZmQJv1aYOGFzOXkP
5x5+ ► https://www.youtube.com/playlist?list=PLI24ciRbl8BW3ZW2TV3arVNgVWsHOM6Ox

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Special thanks to these generous Patrons:
Jake Maul, Dcs Banana, Thisis alexclarkfan, Asteroid, Leland Hoagland, Broxson Barnhill, Ivan Marinkovic, someone 1, Jeremy Johnson, QueenSquare1, Derek Worth, Inventor of Loob46, Eisen Vigilia, Dawson Wilson, Sesha Sai Patro, Gregory Martin, Michael Mendoza, Pete Ryland, Jan Strohbeck, KingIceCream, Victor Giaquinto, Piotr, Leszek Gawron, Leo Li, Ed Connell, Omri Riss chbarbi, Chris Bonnello, Edan Maor, Petrified, Xiaotian Li, Keian Inouye, Riley Lee, Michael Conard, Johnathan Starkey, Those Nerds, whichonemi, Benjamin Force, Isaac Farnsworth, Li Jiang, Hudson, Dakota, James Moore, Csaba Daday, Dmitri Shabes, Voidedifbroken, Rayan Al Hobayb, Ram Thakkar, kavish, Mirzo, Aidan Gerick, Adrin Esterabadeyan, Bernhard Kofler, Cade Watson, Adam Fenn, Paul Thorley, Amay Saxena, Weisselberger Timothee, Philippe Schwartz, Jonas Rongé, Pontus Uggla, Takeshi Yanagita, Jane Qiao, Adam Prato, Ricky Robber, The Slick Cuber, DLyu, Letin, Ruimin Yan, Nina, Benjamin Jonassen, Walter, RedKB, Christopher Robin, Sebastian Szafran, Tipa Reimer, ZHU SHENJIE, Fred Strauss, Danny Williams, Rick Lush, Chris Cobb, Adam Rosales, Martijn Schiedon, David Brown, Taco, Mike Sampson, Siege Wolfe, Rob Peters, Miranda Manning