February 10

 5:20 Can't find much information about the energy being transmitted in a medium by a sawtooth waveform. Though it is obvious, on the right side or decreasing slope of the wave, the speed of the actuator and medium seem to be almost infinite. I mean, the whole motion of the actuator seem to happen in no time.

Ok so we are ignoring this. Not them, those who study earthquakes and acoustics on supercomputers.

It is my intuition right now that says much more energy is being applied on the medium on the right slope of the waveform, which is transmitted in the environment. Sawtooth waveforms are rare in nature, but they can occur in the case of rotating tools that are broken or about to break. You can almost hear the "broken" sound ripping through your body. This is what's happening nowadays with the team that came to redo what they did last summer.

To me it translates as pain. A the end of the day, though they now moved further, i feel so much pain in my body i can't stand to do the dishes or anything.