Stick
A Podcast Of Unnecessary Detail
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How to Write a Mathematical Work With Chalk
Experts writing with chalk can draw a dotted line at high speed, which is often required when doing maths. When you draw your finger down a clean plate, it's the skin on your finger that's vibrating backwards and forwards, not the plate. You can get different notes out of it by hearing the resonating frequency of your finger skin. But in the same way as if you play a violin, badly,. You can get the higher harmonics.
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