By a quirk of nature, the Chinese struggled to create an effective cavalry force because Chinese soil lacks selenium, a mineral essential to the breeding of sturdy horses. They could only import their mounts from the steppes, something the nomads often agreed to, safe in the knowledge that the buyer must soon come back looking for replacements. It was as if, during the early twentieth century, one side always had a monopoly of tanks.
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Under the Tang, the influence of nomads was so strong that the Chinese came to adopt many barbarian customs, from sitting in chairs to wearing trousers.
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In the old Yuan dynasty imperial hunting parks to the south, peasants developed an ingenious method of market gardening, which enabled them to supply the court all year round. They built greenhouses heated by pits dug beneath the carefully tended seed beds.
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Junipers are planted at tombs, not just because their twisting and curling trunks look like dragons but the Chinese once believed that their branches housed strange creatures called wang liang that frightened off evil spirits. - City of Tranquility by Jasper Becker