This video was made at Ikeguchi Laboratory in Japan a few years ago and resurfaces online every once and awhile.
It shows 32 metronomes that are started, all out of sync. As the video progresses (it’s only 4 minutes, but you can jump a bit if you get anxious), they shift and then synchronize themselves.
Magic trick? Nope.
It’s that science that is magic – physics. The video shows that transfer of force can align the metronomes over time.
Transfer of force? You give a toy car a push. It rolls across the floor on its own. It hits another toy car halfway across the room with some force. Wait. How could it exert a force? The only reason it moved was because you pushed it.
After you pushed that first car, a force was transferred to the car. When it had that collision, it exerted a force on the second car. That force came from the hand that pushed it. Forces are transferred.
And yet, the metronomes syncing is still kind of magical. Most of the science I like best has some magic to it.