The 3M company ____ (know) for its innovation for a long time. But there have been mistakes along the way. Today, employees ____ (encouraged) to learn from past mistakes. That’s how Arthur Fry learned about a special glue. It ____ (created) in the 3M lab in 1968. The glue wasn’t strong enough, so it ____ (forget). But Fry found it in 1974 and used it to develop Post-it Notes. The original Post-it Notes ____ (improve) since then, and now they ____ (sell) all over the world.

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