An American engineer named Perry Spencer noticed as he walked past a magnetron (a vacuum tube used to generate microwaves) that the chocolate bar in his pocket had melted - which led to the discovery and invention of the modern microwave oven. Penicillin, for example, was accidentally discovered by German biologist Alexander Flemming while searching for the causes of staphylococci. Some of the most profound scientific discoveries of our time were found while researching something entirely different.
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