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!

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Beginner:
2x2 Tutorial ►    • Learn How to Solve a 2x2 Rubik's Cube (Beg...  
3x3 Tutorial ►    • Learn How to Solve a Rubik's Cube in 10 Mi...  
4x4 Tutorial ►    • Learn How to Solve a 4x4 in 10 Minutes (Fu...  
5x5 Tutorial ►    • Learn How to Solve a 5x5 in 8 Minutes (Beg...  

Special Tutorials:
3x3 One Handed ►    • Rubik's Cube: How To Solve One Handed (OH)  
3x3 Blindfolded ►    • (v.2) How to Solve the Rubik's Cube Blindf...  

Advanced Tutorials:
2x2 ►    • How to Get Fast at 2x2  
3x3 ►    • Beginner + CFOP Method  
4x4 ►    • How to Get Fast at 4x4  
5x5+ ►    • How to Get Fast at 5x5+ (Big Cubes)  

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