[GingisK]

...You can’t just make a mask...

Sure I can.

When I started to setup a manual milling machine in order to show my students how to make a gear, one of them commented, "I didn't know you could make gears. I thought you had to buy them".

[lepton]

When I started to setup a manual milling machine in order to show my students how to make a gear, one of them commented, “I didn’t know you could make gears. I thought you had to buy them”.

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So much knowledge lost about the real, physical world. That response is akin to so many things I have heard said about subjects from meat, to electricity, to engine oil and gasoline.