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THE Chinese call the Yellow River their 鈥渏oy and sorrow鈥� because its
life-giving waters so easily turn to killer floods. But the floods were once
much worse, says Ge Yu of the Nanjing Institute of Geography and Limnology. He
compared the sediments left by recent floods with those laid down over the past
9000 years. He found that the 鈥渃ataclysmic鈥� 1843 flood鈥攖he worst in 2400
years of recorded history鈥攚as exceeded four times between 6000 and 8000
years ago (Geomorphology, vol 33, p 73).