Isn't it really dangerous to build stuff from only one substance considering resonant frequenties?

Isn't it really dangerous to build stuff from only one substance considering resonant frequenties?
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The Parthenon would be standing to this day if it weren’t for invaders.The Eiffel Tower -all steel.Castles of the world being made of stone still standing to this day. It seems different materials don’t matter. As for Tesla’s machine,no.Someone would have that by now and would be knocking down buildings.
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