Chart A
return to article Chart B Both of these graphs -- based on data in Science, Vol. 348, p. 522, Dec. 12, 1996 -- are reproduced courtesy of Australian author and lecturer John L. Daly and his website. return to article
return to article
Chart B
Both of these graphs -- based on data in Science, Vol. 348, p. 522, Dec. 12, 1996 -- are reproduced courtesy of Australian author and lecturer John L. Daly and his website.
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