For many years, cesium atomic clocks have been reliably keeping time around the world. But the future belongs to even more accurate clocks: optical atomic clocks. In a few years' time, they could ...
When walking through an unfamiliar city, we might rely on different types of directions. Head east out of the train station, take a left at the stoplight, turn at the building with the mural. To move ...
Today is Martin Luther King Jr. Day in Alabama. But alongside honors for the slain civil rights leader is recognition for Civil War general Robert E. Lee. Alabama and Mississippi are the only states ...
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