Do schools kill creativity?

Much time is spent in schools memorizing or learning how to find the right answer. Testing further emphasizes the idea of avoiding mistakes. Yet many ideas that in retrospect seem revolutionary were actually the product of serendipity. For example, both penicillin and Post-it notes were the result of mistakes. Does the standard education today teach kids to avoid risk, to avoid mistakes, and to stifle creativity? Sir Ken Robinson says 'We are educating people out of their creativity.'