Across the United States, many celebrate Columbus Day, a controversial federal holiday observed every year on the second ...
As scientists get closer to putting humans on Mars, the need to understand why clocks tick faster on the red planet is more ...
The previous essay showed that in the 1400s, Africa was not a “dark continent” but a continent of light — a leader in knowledge, trade, and culture. Cities like Timbuktu rivaled Oxford and Cambridge ...
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