That metronome thing is misleading, they are on a wobbly table, the wobbly table forces the result. Put them on cement, see how long it takes then. Not to say the point isn't valid, but 'because they are running close to each other' is not why they sync up, that the table they are on wants to wobble at a single frequency is why.
Yep. Sympathetic resonance harmonics require a common medium in which the resonance can be communicated across the medium. In this case, a table top.
Harmonic isolation or simply different tables prevent it.
https://www.livescience.com/34608-break-stride-frequency-of-vibration.html
Agreed, this video is just a bunch of misleading nonsense. I'm not saying that graphene of a certain configuration doesnt have a resonant frequency, but whatever it is has nothing to do with metronomes syncing up on a table suspended with strings. That is just an artsy way to segwaying into video clips of armys marching goosestep. There is literally no scientific merit to this video whatsoever.
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