When did science begin? Perhaps when early humans, more than a million years ago, picked up rocks and chipped them to form stone tools. Someone tried several different kinds of rocks. She or he noticed that a particular type of rock produced a cleaner, sharper edge than the other types. This was one of the first trial-and-error series of experiments. Gradually other kinds of rocks were tested and found to be even better. Materials scientist do the same today, formulating the latest metal alloys and tailor-made composits for special purposes.
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