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The African source of the Amazon's fertilizer Sid Perkins In the winter months in the Northern Hemisphere, massive dust storms from the African Sahara waft southwest across the Atlantic to drop tons of vital minerals on the Amazon basin in South America. Now, scientists have pinpointed the source of many of those dust storms and estimated their dust content. ON THE WAY. Satellite photo shows dust (arrow), bound for the Amazon, blowing away from the Sahara's Bodélé depression. NASA The Amazonian rainforest depends on Saharan dust for many of its nutrients, including iron and phosphorus (SN: 9/29/01, p. 200: http://www.sciencenews.org/articles/20010929/bob9.asp)....

Greek and Roman writers record the use of a substance called miltos as a decoration, a medicine - and a handy way to repair a boat. Now scientists have worked out why. Andrew Masterson reports. From ancient Greek and Roman source texts it is possible to conclude that in the classical world a mineral, a powder known as miltos, was something of a wonder substance. Miltos - referred to in the works of writers such as Theophrastus, Dioscorides and Pliny - was red, fine-grained, and made up mostly of iron-oxide. By the time Theophrastus, a Greek philosopher and proto-botanist, wrote...