After about a century of research, scientists in Switzerland have finally solved the mystery of the holes in Swiss cheese. Despite what you may have been told as a child, the holes are not caused by mice nibbling away inside cheese wheels.
Experts from Agroscope, a state centre for agricultural research, said the phenomenon was caused by tiny bits of hay present in the milk and not bacteria as previously thought. They found that the mystery holes became smaller or disappeared when milk used for cheesemaking was extracted using modern methods.
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