The first recorded use of paper currency in the world is believed to have occurred in China during the Tang Dynasty (618-907 AD). The Chinese used paper money in the form of “jiaozi,” which were paper notes issued by the government that could be exchanged for gold or silver. The jiaozi were used primarily as […]
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Coordinating risk assessments for radiation in outer space
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In the next few decades, crewed missions to the moon and Mars will likely
become frequent. One of the main challenges faced by these future missions
will b...
11 hours ago
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