This week, Sam Kean takes a look at some ridiculously precise standards — the meter, the second, and other international standard units — and ... on the periodic table, cesium has one more ...

This week, Sam Kean takes a look at some ridiculously precise standards — the meter, the second, and other international standard units — and ... the periodic table. The PopSci team has ...

For these reasons, rulers throughout history—Charlemagne, Alexander the Great, Louis XIV, Moses—all tried, in vain, to impose standard units across their kingdom. (In the Old Testament ...