Answer:
Because no repeatable studies about them have been published in a peer reviewed journal.
Science is based in evidence, from observation or experiment, published in a paper with a clear description of how the evidence was obtained, and reviewed by people withe knowledge of the field before publication.
Nobody has done that. Or if they have, their findings did not survive review.
The standard question for any superstition is “How do you know that?” Not “Who told you that?” If someone told you, how did they know it? You have to be able to trace back to someone who actually collected the data, and how they know it. Which is why you need the published paper - you can get back to the original research, bypassing all the intermediate stages of teachers. Provided that the paper exists.
Explanation:
Im so happy to help.
