What are the examples of superstitious beliefs with scientific explanations?

Answer:
Broken reflection - 7 years of bad luck if you break a mirror. This one originated in the Middle Ages where mirrored glass was extremely expensive; anyone who broke the large mirror of the lord or lady of the land was costing them a lot of money and destroying something likely not replaceable. A person could be put in jail if the lord of the land was pissed off enough.
*ohyesilied*:D
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