The history is full of astonishing discoveries that no one was searching for, yet later proved to be of great scientific or cultural significance. A practical device like the vacuum cleaner was invented by an asthmatic janitor to protect his bronchial tubes. The artificial sweetener is credited to a Russian chemist who forgot to wash his hands during his experiments. The antibiotic was discovered by a Scottish bacteriologist who neglected to clean his lab and allowed a petri dish with bacteria to go moldy. The first scientific personality test, still used by many companies today, was developed by a mother who approached her daughter's boyfriend with great skepticism.