ON April 18, 1980, the sky over Beijing was suddenly darkened by dust although hardly any wind was noticeable. Within a few minutes a coating of dust had collected on rooftops, windowsills, everywhere...
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ON April 18, 1980, the sky over Beijing was suddenly darkened by dust although hardly any wind was noticeable. Within a few minutes a coating of dust had collected on rooftops, windowsills, everywhere...