lol
I remember watching that video in physics class, imagine how the engineer felt when he realised he hadn't taken WIND into account.
Yes, everything has a resonant frequency, and if for example there were a small but sustained earthquake vibrating at exactly that frequency (unlikely, I'll admit), the building would sway with greater and greater amplitude until it eventually collapsed. Just like that bridge.
It's the same as when you're on a swing, and you put a little push in every time and you go higher and higher, but if you were to push much faster but not at the same rate as the swing, it wouldn't help.
Physics lesson over
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