On the other hand, since it's a property of the universe maybe now's the time to... | Hacker News

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		rwmj 11 days ago \| parent \| context \| favorite \| on: One quantum transition makes light at 21 cm On the other hand, since it's a property of the universe maybe now's the time to define 21 cm as this value.

xnickb 11 days ago [–]

then cm will become a bit longer and it'll break many things

ncoco 11 days ago | [–]

Like the width of an A4 sheet of paper.

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