The kilogram is redefined, and scientists say it was worth the weight

In a subterranean vault in a suburb of Paris lies a small, rarely seen metal cylinder known as Le Grand K.For 130 years, this golf-ball-sized hunk of 90% platinum and 10% iridium has served as the international prototype kilogram. That means it was the single physical object by which all other...
Source: Los Angeles Times - Science - Category: Science Authors: Source Type: news
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