The Atlantic interviewed Dr. Demetrios Matsakis, Chief Scientist for Time Services at the US Naval Observatory about where time comes from, the precision required and how they obtain it, and why we need such precision. Five seconds into it, my wife commented, “That sounds nerdy.” That’s how you know it’s gonna be good.
Where time comes from
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Income in Each State, Adjusted for Cost of Living
A dollar might not buy you as much in one state as it does in the other.