Peekaboo is universal to all cultures, and developmental psychologists believe it is important to infant development

Interesting and funny fact about Peekaboo: 

Did You Know? Peekaboo is universal to all cultures, and developmental psychologists believe it is important to infant development. Babies don't read books, and they don't know that many people, so the surprising durability and cultural universality of peekaboo is perhaps a clue that it taps into something fundamental in their minds. No mere habit or fashion, the game can help show us the foundations on which adult human thought is built. source

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