While the exhibit at Paradise Ridge is | |
What we do know is that this self-taught, free African American tobacco planter was, among other things, a mathematician, scientist and astronomer who helped establish the boundaries of Washington DC. To this day, nearly all 40 of those boundary stones – which mark the original 10-mile-by-10-mile diamond shape of the US capital city – remain in plain sight. They are the oldest set of federally placed monuments in the United States. อ่านต่อเพิ่มเติม> โรงเรียนบ้านคลองสุข สาระน่ารู้> ทันตแพทย์ | |
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