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Tony Hoare calls his invention of null references his "Billion Dollar
Mistake".

http://qconlondon.com/london-2009/presentation/Null+References:+The+Billion+Dollar+MistakeImage Removed

Also note that in some programming languages not all values are permitted to be null. For example, in Java, values of type boolean, byte, short, char, int, float, long, and double may not be null.