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qwerta
on Oct 6, 2013
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How do you turn a chunk of glass into a telescope ...
I am Czech and I would not understand what "mirror grounding" means.
amock
on Oct 6, 2013
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[–]
The words "grounding" and "grinding" are not related in meaning: "grounding" refers to "ground", meaing the surface of the Earth, and "grinding" is a participle of "grind". See
https://en.wiktionary.org/wiki/ground
for details.
sp332
on Oct 6, 2013
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[–]
"Ground" is the past participle of "grind" So: I grind, I am grinding, I had ground, I was grinding.
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