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- Wed Sep 28, 2011 5:40 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0957: "Development"
- Replies: 87
- Views: 22253
Piaget's stages of cognitive development has only four stages...that's the joke here. Well, that and the imaginary fifth stage is trying to emulate how a psychiatrist might describe a storm's destructive tendencies.