Someone explain
(www.youtube.com)
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https://www.youtube.com/watch?v=xv70B0T3cUM
https://www.youtube.com/watch?v=XQkQwsBhj8I
https://www.youtube.com/watch?v=tdUSZwAHZXU
There are many more of these experiments.
So, back to my question. Why exactly do you think they would have needed diamond cutting bits?
Thanks for these links. I learned something this morning.