Metal - old style Diodes

Before semiconductors were invented we had Diodes for rectification which
were metallic of some sort. Does anybody remember? I am interested if it is
possible to make a Diode from two dissimilar metals. Why? Well folklore has
it that in some rare occasions people have heard radio stations via two
fillings on top of each other in their teeth.
Also, some claim that a house can vibrate to local radio stations due to the
metallic structure. Possible or rubbish?


Tam



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