Say Au Revoir To That Hunk Of Metal In France That Has Defined The Kilogram
A small cylinder called Le Grand K has defined the kilogram for more than a hundred years. But if a scratch ever rendered it lighter, the definition of the kilo literally shifted. Time for a change.
Đọc thêm tại NPR
at November 13, 2018 at 05:06PM
Health & Science
Thứ Ba, 13 tháng 11, 2018
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