In 1968, a failed adhesive formula developed at 3M resulted in tiny yellow notepads whose individual papers could stick just about anywhere. The Post-it note is perhaps the most popular of all the genius accidental products that have become staples of our lives, but there are others, too—from penicillin to Velcro to superglue. Now, there’s another to add to the list. A Colombian company called Glasst Innovation made an unexpected discovery that led to the creation of Unpaint—a...

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