Get 75% off NordVPN with this link: and use the promo code steve to get the first 30 days free. Quartz watches have a tiny crystal tuning fork inside that vibrates at 2^15 Hz and there's a really clever reason for that. This video also talks a bit about how mechanical watches work.
CORRECTION: Ok, so I actually hung 16 flip flops! So you do need 15. I'm an idiot.
The atomic clock video is here:
The piezoelectricity video is here:
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