In the US, eggs have to be washed. This reduces the chance of salmonella contamination, but it also washes off a protective layer that keeps bacteria from entering the shell. As as result, we have to refrigerate them to keep bacteria from growing. In Europe and many other places, the eggs aren’t washed. This means the protective layter is still intact, and the eggs can be stored at room temperature. Both ways are perfectly safe, it’s largely just a matter of preference.
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