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Well done Everyone !
I'll be handing out chocolates next term.
To avoid stressing the bridge excessively... if they march in step, there's a chance that their steps will coincide with the resonant frequency of the bridge and cause possibly dangerous amplified shaking of the whole structure
And anyone who's ever heard the sound of 100 boots or more marching - that sound can stir the skin and it's resonation create a huge emotional response.
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